I'm talking about being able to create an event and invite people to it, and let them specify whether they are coming or not. This is the main feature my friends use in Facebook, other than posting comments.
And Facebook is a platform oriented towards interacting with `meatspace' friends, while Mastodon is for microblogging. I feel that `event creation' would be a significant and unfortunate scope creep considering other platforms are better-equipped to handle it.
