Yeah I would expect upcoming events to be the default as you describe, minus undated events.
Activity / Last Updated I can see a use case for but … as an organizer I don’t really want to necessarily have edits visible in the UI (of course an API / atproto feature).
As an organizer, I would want a pref on whether or not to show dates with other status in main upcoming (default to show all).
“Might not have a date” is definitely a thing but is kind of a whole other use case that for me personally would be low on the priority list to show at all — eg show undated events pref, default to no.
(And actually gives me a way to draft things - nice!)