(sorry for the rambling post)
"Theatrical performance", maybe? That'd definitely cover musicals and opera (but possibly not ballet—but I'm not sure "stage performance" covers it either, at least not without covering everything). Or just "performance", which definitely covers it (but a lot more, too).
If you Google for "theatrical performance" you get stuff a lot closer to what you want than Googling for "stage performance". Not to mention almost every concert is done on a stage...
Also, looking at the ticket—don't a lot of concerts of modern music include dancing, effects, etc.?
I'm not sure what we're trying to get at with the event types—but e.g., a sit down, be silent, applaud politely classical concert is very different from a rock concert (both, though, are "concert"). If the event type is supposed to give you some idea what the event was like—we need quite a few more event types.