Final Ranking of FOSS Event Infrastructure Through a Bitcoin, Privacy, and Sovereign-Stack Lens

Gancio describes itself as “a shared agenda for local communities.” That framing matters. This is not social media disguised as events. It is a community calendar built around events themselves, not personal timelines. The official site explicitly explains that anonymous event submission is enabled by default and that the absence of user-centric views is intentional. The project also documents broad ActivityPub interoperability, while third-party deployment material and project notes confirm export paths through RSS, ICS, widgets, and other open formats.

Mobilizon is the strongest “full platform” in the field. The official documentation presents it as a federated organization and mobilization platform designed to help groups leave Facebook events, Meetup, and similar systems. The software supports multiple profiles from one account, explicitly so that different identities can be compartmentalized. The project also documents ActivityPub federation and RSS/ICS/WebCal export flows, making it substantially more interoperable than a closed event silo.

Gathio is the sharpest privacy-first design in the list. The official site states plainly that there are no accounts on the flagship instance; creating an event generates an editing password, and providing an email is optional. The flagship instance also states that events are automatically deleted seven days after they end. Meanwhile, the configuration docs show that the deletion window is an instance-level setting (delete_after_days) and that event creation can be open or restricted. The federation docs confirm that RSVP, comments, and updates can flow through ActivityPub-compatible services.

Flockstr leads the Nostr layer because it is not only adjacent to Bitcoin — it is explicitly moving events, RSVPs, tickets, and payments into the Nostr/Lightning stack. The project site says “Own your Events. Only on Nostr.” The OpenSats grant announcement describes Flockstr as a calendar events app on Nostr where users can create events, post updates, invite users, issue tickets, and collect payments. Lightning Labs also highlighted it specifically as a Nostr alternative to Meetup or Facebook Events with Lightning zaps integration for rewards and ticketing.

Meetstr presents itself as an open-source web Nostr client for discovering, viewing, and managing NIP-52 calendars. That description is important because Meetstr is best understood as a calendar layer inside Nostr, not as a full alternative to pretix or Mobilizon. Its AGPL licensing gives it a stronger anti-capture posture than MIT-licensed Nostr peers, and its role as an event browser/manager makes it a useful stack component even when it is not the main publishing engine.

Plektos is a decentralized meetup, events, and calendar platform built on Nostr. The repository notes a MIT license and identifies the project squarely as a Nostr-native event layer. Unlike Meetstr, which reads more like a calendar manager, Plektos is positioned closer to a decentralized meetup product. The ranking remains restrained because public evidence still points to a relatively young and still-hardening project rather than a widely proven operational backbone.

Agorakit is best treated as a local organizing suite rather than a pure events kernel. The project describes itself as open-source web-based groupware for collectives, with a forum, calendar, file manager, and email notifier. The support material also states that groups can export their data and move elsewhere, which strengthens its sovereignty profile. It ranks below the top event kernels because email notifications, files, and richer group management carry more metadata surface and because there is no deep Fediverse or Nostr federation layer comparable to Gancio, Mobilizon, or the Nostr-native stack.

pretix is not a generic meetup clone. It is a substantial ticketing system for conferences, festivals, exhibitions, workshops, and other structured events. The project’s official materials describe AGPL licensing with additional terms, while the licensing FAQ clarifies the dual-licensing model. Importantly for Bitcoin-centered deployments, BTCPay Server documentation covers pretix integration, and the pretix-bitpay plugin provides a direct path to Bitcoin payment acceptance.

LAUTI positions itself as an open-source community calendar and is already used in several public instances. The official site documents ICAL and RSS feeds, an open REST API, and a WordPress plugin, which is enough to give it a real interoperability score rather than treating it as a dead-end silo. But its shape is still that of a community calendar with registered entities and public listings, not a privacy-maximal ephemeral system.

Openki is fundamentally a peer-to-peer learning platform for non-commercial education opportunities. The project’s own materials emphasize local, self-organized knowledge exchange rather than generic event scheduling. The main ranking penalty comes from licensing: the project is described in external documentation as open source under the TNU ATPG license, freely available for non-commercial use. Under a strict FOSS maximalist filter, that is materially weaker than AGPL, GPL, or MIT because it constrains downstream commercial or entrepreneurial reuse.