I tried to buy tickets online for tonight but it says they are only available at the door. Does that mean the pre-sale are all sold out?

Sometimes they only sell at the door

Go early to make sure you get a seat, you can always order food in or sometimes they have a BBQ Truck outside.

There is no pre-sale with Rhythm Room. Usually you have to buy your ticket at the door. Door usually opens at 8 so get there at 730 to stand in line if you want a seat. It's a small venue.

Just go and get them at door.

First come first served