If anything, Mumor is easily the least tired out holiday event. She has a freaking contiguous story arc, for crying out loud! That's a lot more than I could say for something like, say, Celestial Nights, where you can't really tell whether or not it's the exact same dang people falling for each other during their performances time and again.

The fact that the Sunbreeze Festival also has several other mini-games to go with it arguably makes it the only holiday event worth keeping any more, perhaps alongside Starlight Celebration and maybe the Harvest Festival.