At the school festival, you should win the game at the PC club, but don’t worry if you don’t. (Contrary to popular belief, it IS possible to lose the game.) By now, you shouldn’t need the +10 bonus to all stats you get at the end of the day if you do anymore.
When Kameo asks you if Mikae is your girlfriend say that’s right. (or not, it doesn’t seem to matter in the end...)