Very happy you're enjoying it so much! Glad to see the little details are appreciated~. For now, the parties are just a place to have some fun, although that might change in the future. There's no way to move up there yet or get a permanent pass. That's waiting on a certain route to be done. For the tower infestation, you do essentially have to fight. I could consider some obscure way to cheese the place I suppose?
For Fawn, make sure you've checked the club and talked to everyone there!