So we are trying to help with event discovery. Here's what we have so far .... Firstly, you create your account:
Then you can follow other accounts, on the same server or on other servers (more on federation later). Your can allow anyone to follow you, or approve each follower.
Then you can go to discover, and browse all the events people you follow are publishing. If you like one ... you've just discovered a new upcoming event! You can add it to your set of events to recommend to your followers.
Or add events you know about to pass on to your followers. (Note the various privacy level options, and you can choose different levels for different events). This way, you help others discover great events.
We are about event discovery and don't try to take over an events existing ticket system, sign ups, etc ... instead we direct people straight back to the original home of the event online.
We even handle reoccurring events with the standard RRULE options (although the web UI to edit this needs work)
You can also tag events for easy sorting (and Tags have privacy levels too).
We support events in different time zones, and let people browse in any timezone they want.
If your events are public, others can easily export them with JSON and iCal feeds. Totally open, no authentication needed.
For federation, follows and approvals are passed between servers and public events are federated between servers running our software. Over time, we hope to use #ActivityPub fully to trade data with other event software.
And some things we didn't mention! Many rough edges and a lot to do, but if you are interested or just want to let us know what you think of the idea get in touch. There is more on our website: https://www.theoccasionoctopus.net/
We can import iCal feeds online straight into events in your account. There is also a Read/Write API so you can program bots that add events; here's some Python code to scrape events from a website, for instance.