As of right now, the only options on the form are conference, meeting, competition, and jam, so if anything is labeled minicomp still, that probably means that either that event hasn’t been added to the database yet, or it’s been added, and no one deleted the old category on that page.
I guess I would try to figure out if we like the form options as they are, or not, and once we are sure we like the options, delete any old category tags from event pages if they aren’t on the form. And yes, use the form to sort the events.
(Personally, I don’t really see a need to have a separate “minicomp” category. I think that might just make it more complicated to sort things than it already is.)
Also, you might be interested to read this thread: Jam vs competition