This memorandum has been prepared for prospective OEM buyers and private investors to outline the acquisition opportunity for the Calendar Invite Server (CIS) technology and its associated intellectual property from 31events.com.
The CIS is a proprietary, production-ready messaging pipeline engineered to solve a fundamental inefficiency in digital event communication. It represents a unique opportunity to acquire a defensible technology asset with a clear path to commercialization within a large and validated market.
1.0 The Market Problem: The Inefficiency of Current Event Communication
Despite the global ubiquity of digital calendars, the methods for getting events onto them remain fragmented, high-friction, and inefficient. This gap between user reliance on calendars and the technology used to populate them represents a significant and largely untapped opportunity for optimization and value creation. The current ecosystem is characterized by outdated workflows that fail both event organizers and their audiences.
The status quo in the primary markets of email, web, and application-based communication is defined by a heavy reliance on cumbersome email workflows and reminders. As noted in market analysis, “it’s extremely inefficient and costly when you add up all the daily emails trying to get an event onto a customer’s calendar.” This is not merely an inconvenience; it represents a significant, unmeasured operational expenditure in wasted man-hours and a direct loss of marketing ROI due to poor engagement and a lack of reliable attendance data.
The most common workaround, the ‘Add to Calendar’ button, is a fundamentally flawed solution. For the end-user, it is a high-friction, multi-step process that often involves downloading a static .ics file and manually importing it into their calendar client—a workflow fraught with potential for user error and abandonment.
More critically, the ‘Add to Calendar’ method creates a severe data gap for event organizers. This one-way data drop provides no mechanism for collecting RSVP receipts (Yes, No, Maybe), as the reply data “goes nowhere.” This forces organizers to deploy separate, cumbersome RSVP forms, creating a disjointed user experience and preventing them from collecting valuable telemetry on user intent. This forces organizers into a fragmented and data-blind workflow, highlighting a clear and urgent market need for a unified solution that closes the loop between event notification and intent measurement.
2.0 The Solution: The Calendar Invite Server (CIS) REST API
The Calendar Invite Server (CIS) is the definitive solution to the market’s inefficiencies. It is a programmable, embeddable messaging pipeline, delivered as a REST API, that is purpose-built to integrate natively with all major calendar clients. CIS transforms the calendar from a passive scheduling tool into an active, trackable communication channel.
The core functionality of the CIS is a REST API that manages the complete calendar invite lifecycle: Create, Send, Track, Update, and Cancel. This allows an acquirer to embed a powerful, modern event communication engine directly into their existing products and workflows.
For event organizers, the CIS workflow is uniquely elegant and efficient. It leverages the existing, familiar calendar client (e.g., Google Calendar, Microsoft Outlook) as the primary interface to create and manage events. This approach is a strategic masterstroke, as it requires zero new training for a global user base already exceeding 1 billion daily, eliminating the single greatest barrier to enterprise adoption.
Once an event is processed, the CIS generates a suite of embeddable API codes ready for immediate deployment across various platforms. Key use cases include:
Call-to-Action Buttons in Email Marketing: Replace static ‘Add to Calendar’ links and RSVP Forms with dynamic, trackable RSVP buttons.
One-Click Invites on Web Pages: Enable seamless event sign-ups for sporting events, webinars, or product launches directly from a landing page.
API Calls from Applications: Integrate direct calendar invite capabilities into CRMs and other systems of record to automate event sending and enrich customer profiles with engagement data.
In summary, the Calendar Invite Server is a foundational technology that elevates the calendar invite from a simple, static notification into a dynamic, two-way communication and data collection channel.
3.0 Competitive Advantage: Superiority Over Existing Methods
A defensible competitive advantage is the cornerstone of any valuable technology asset. The Calendar Invite Server’s unique architecture provides a fundamentally superior workflow for organizers and a frictionless experience for end-users, creating a significant moat against the status quo and incumbent providers. The CIS is not an incremental improvement; it is a categorical shift in how event communication is managed.
Attendee Action
Calendar Invite Server - A simple, one-click “Yes, No, Maybe” response directly within their calendar or email client.
Status Quo - A multi-step process: clicking a button, being redirected, and filling out a separate form.
Event Updates
Calendar Invite Server- Changes are seamlessly and automatically pushed directly to the attendee’s calendar, keeping it up to date.
Status Quo - Non-existent. This method requires a new email blast, forcing users to manually update their own calendars.
Organizer Workflow
Calendar Invite Server -Simple and integrated. The entire event lifecycle is managed from the organizer’s own familiar calendar client to the REST API of the Calendar Invite Server Pipeline.
Status Quo - Complex and fragmented. Requires logging into multiple platforms to generate buttons and manage separate RSVP forms.
Communication Channel
Calendar Invite Server -Establishes a direct, two-way communication channel to the attendee’s calendar for the life of the event.
Status Quo -Creates a one-way, one-time data drop. The customer downloads a static file, so there is no persistent connection.
Comparative Analysis: Calendar Invite Server vs. ‘Add to Calendar’ Buttons
Furthermore, the CIS is strategically differentiated from incumbent calendar providers. While powerful, platforms from Google and Microsoft are architected as closed ecosystems, not as OEM-friendly, embeddable engines.
They deliberately lack the programmable REST APIs required for deep third-party integration into marketing automation or CRM workflows, a market gap the CIS was purpose-built to exploit. This superior solution unlocks a significant and quantifiable market opportunity for the strategic acquirer.
4.0 Market Opportunity & Target Segments
The addressable market for a technology that optimizes calendar interactions is immense. With a combined 1 billion daily users across Google and Microsoft calendar platforms, the calendar is one of the most embedded and essential tools in modern personal and professional life. The opportunity lies in monetizing the interactions that bridge corporate systems and this massive user base.
Market validation for this thesis is clear and compelling. The success of Calendly, a company focused on streamlining just one aspect of calendar interaction, demonstrates the significant commercial potential. Calendly achieved a $3 billion valuation on the back of a projected $300 million in revenue for 2025, proving that businesses will pay a premium for technology that removes friction from their scheduling workflows. Calendly’s success habituated millions of users to receiving and trusting third-party calendar invites for scheduling, effectively de-risking the market and validating the demand for direct-to-calendar communication.
The CIS is positioned to be acquired and integrated into several high-value strategic segments. The primary OEM target markets include:
Transactional & Email Marketing Providers (e.g., MailChimp, Klaviyo, SendGrid): These platforms can integrate CIS to offer their customers a vastly superior alternative to ‘Add to Calendar’ buttons, enabling direct RSVP tracking from within their campaigns and dynamic event updates.
Web Development & Agency Platforms (e.g., Website Builders, Landing Page Software): Acquirers in this space can provide their clients with turnkey tools to create one-click event sign-ups on web pages, replacing inefficient forms and delivering a modern, frictionless user experience.
Software OEMs & CRM Providers: By integrating CIS, these companies can enable their users to send calendar invites directly from their system of record, enriching customer data with valuable event interaction telemetry.
The technology’s versatility has been proven through the development of solutions for complex, multi-event schedules. Vertical markets such as Sports (NFL, NBA, MLB), Entertainment, and Technology Events require the ability to display thousands of individual events and allow users to subscribe with a single click—a use case the CIS architecture handles seamlessly. An acquirer can leverage this proven, flexible technology to immediately penetrate these lucrative markets.
5.0 Technology, Architecture, and Deployment
The Calendar Invite Server is not a concept; it is a fully realized, production-ready technology stack engineered for rapid, flexible, and cost-effective deployment by an Original Equipment Manufacturer (OEM).
The core of the platform is built entirely on the AWS serverless stack, leveraging a suite of robust and scalable services including Lambda, S3, DynamoDB, and AWS Simple Email Service (SES). This modern architecture ensures exceptional scalability, high reliability, and a remarkably efficient cost structure.
The deployment model is designed for complete OEM control. The entire CIS stack is deployed via a single CloudFormation template directly into the acquirer’s own AWS account, providing full access to the underlying Python source code and the ability to modify workflows. This deployment model de-risks the acquisition by eliminating vendor lock-in, providing the acquirer with complete operational sovereignty, and ensuring transparent, predictable infrastructure costs.
The acquisition includes www.calendarsnack.com, a fully functional front-end application built on VUE.JS. This application serves as a powerful graphical user interface (GUI) for organizers, providing a complete out-of-the-box solution that can be immediately rebranded or refactored by the buyer.
This powerful and complete technology stack is available at a compellingly low operating cost. Based on in-depth analysis, the projected raw AWS infrastructure cost is approximately $10,000 per year for every 1 million calendar invites sent.
This turnkey, low-overhead, and highly customizable asset provide a clear and profitable path to market, underpinned by defensible intellectual property.
6.0 Intellectual Property & Defensibility
In any technology acquisition, defensible intellectual property is paramount to long-term value. The Calendar Invite Server is protected by a series of interlocking architectural inventions and proprietary workflows that create a significant and durable competitive moat. These are not isolated features but interlocking inventions that create a virtuous cycle: a frictionless user interface accelerates data ingestion, which feeds a proprietary processing pipeline, enabling a stateful API that transforms a static notification into an intelligent, dynamic communication channel.
Core Technology Differentiators
Unique CRUD Interface: The system uniquely uses the organizer’s native calendar client (Google/Outlook) as the interface for Create, Read, Update, and Delete (CRUD) operations. This invention eliminates the need for user training, leveraging a tool already used by a billion people daily.
Automated Code Generation Workflow: CIS features a proprietary process where an organizer sends a calendar event to a designated email address, and the system automatically ingests the data and returns embeddable API codes for web, email, and app deployment within minutes.
Proprietary Data Processing Pipeline: The technology is built around a specific method of disassembling raw calendar event data using a series of stateful processors—termed “Inbound, Outbound, and Update Processors”—orchestrated with AWS serverless components.
Dynamic Invite Reassembly: The REST API possesses the unique ability to reassemble event data on the fly into a correctly formatted multipart calendar invite that is specifically crafted to request trackable RSVP receipts (Yes, No, Maybe) from the recipient’s calendar client.
Stateful Event Lifecycle Management: The system meticulously maintains the state of each unique event identifier (UID), enabling it to seamlessly push updates and cancellations only to attendees who have previously responded with ‘Yes’ or ‘Maybe’.
These interlocking innovations make the CIS difficult to replicate and form the foundation of its long-term value as an exceptionally defensible asset.
7.0 Go-to-Market & Acquisition Rationale
The go-to-market strategy for the Calendar Invite Server technology is the direct sale of the complete platform and its associated intellectual property to a strategic OEM or private buyer with the existing scale and customer base to rapidly commercialize its capabilities.
Strategic Value for an Acquirer
Defend and Increase Per-Seat Revenue: Integrate CIS to embed significant new value into core offerings, justifying premium pricing tiers and increasing platform stickiness in competitive markets.
Unlock New Usage-Based Revenue: Monetize the platform directly through usage-based pricing models for API calls, event sends, or advanced analytics, creating a new, high-margin revenue stream.
Establish Competitive Differentiation: Owning this technology provides a decisive advantage over competitors still relying on outdated ‘Add to Calendar’ buttons and fragmented RSVP forms, positioning the acquirer as an innovator.
Penetrate New Markets: The CIS provides a turnkey solution for entering adjacent, high-growth markets such as event marketing, enterprise communications, and large-scale scheduling with a proven, ready-to-deploy platform.
The Calendar Invite Server represents a rare acquisition opportunity: a technologically superior solution to a widespread market inefficiency, addressing a large and validated market, protected by defensible IP, with a clear, low-cost path to commercialization.
For a discerning strategic acquirer, the CIS is not merely an incremental feature—it is a foundational asset to own the future of event-driven communication, creating an unassailable competitive advantage and unlocking significant new revenue streams.
QNA
Question – Explain to me how the Automated RSVP Buttons work for Email Embed.
Answer -https://www.calendarinvite.com/s/rsvp-buttons-for-1-click-calendar
Question – Explain to me how the Automated Landing Pages work for Web Embed.
Answer -https://www.calendarinvite.com/s/calendar-invite-landing-pages
Question - How would a developer integrate Calendar Invite Sending into an App?
Answer -https://www.calendarinvite.com/p/the-aws-calendar-invite-server-with
Question: What makes deployment easy for the Organizer and the Software OEM? (Client)
Answer - https://www.calendarinvite.com/p/the-3-processors-of-the-calendar
Question – Explain the technology behind the Calendar Invite Server API codes.
Answer -https://www.calendarinvite.com/s/calendar-invite-server
Question - Is there a Market Analysis for Calendar Invite Sending?
Answer - https://www.calendarinvite.com/p/add-to-calendar-market-2025-analysis
Question – How did Arnie build out the 272 Games for the NFL into a Calendar Invite Schedule?
Answer - https://www.calendarinvite.com/p/embedding-272-calendar-calendar-invites
Contact – Greg Hanchin. Co-Founder. greg@31events.com - 720-261-0117 TXT OK.
YouTube - https://www.youtube.com/@calendarinvite/videos
GitHub - https://github.com/calendarinvite/calendarinviteserver/wiki/AWS-Calendar-Invite-Server-%E2%80%90HLD
NFL Demo Site for Vertical NFL Market Solution built by Co-Founder Arnie
