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 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.
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/