Don’t rent a house and cram 30 people in it. You can’t afford the bill for when the owner finds out the place got wrecked by 30 people you thought you knew but you really didn’t.
First call- the event organizers, if this is some common thing that people don’t book their trips until a month and a half out they should have a game plan
After that find a cheer forum or Facebook group discussing this. To echo PP you need serious cheer focused help and fast. You can also call all the Disney springs hotels and bonnet creek hotels and see about getting a block of rooms.
The transport could be the sticking point, I don’t know how you transport 30 people to all the events. That could be the sticking point that has you sitting down with these girls saying we’re too late, we can’t travel as a group.