Earlier quoted context omitted.
If you mean the field of people organising events on open source decentralised software, I think there is: * https://framagit.org/les/gancio * https://github.com/lowercasename/gathio * https://github.com/GetTogetherComm/GetTogether * https://github.com/hometown-fork/hometown Mastodon fork with basic event stuff (This is not to take away from Mobilizon - congrats to them!)
It doesn't look like Hometown supports events: > If you've dreamed of a fediverse where you can send out calendar events and RSVP to things, well, this doesn't do that but it's a step in the right direction because it encourages rich content types. https://github.com/hometown-fork/hometown/wiki/More-content-...
Thanks. It was included because I heard a comment in https://conf.activitypub.rocks/#talks "Let's Play and Win Our Own Game" saying it had basic support.