When the RA's party together, it is called an RA Soiree. Also, in some cases, if a previously established, non-RA related party consists of over 50% RA's, the party becomes an RA Soiree.
The location is usually the RA that happens to have the biggest room/ the room farthest away from the hall director - RA apartments are ideal. The soiree always goes hard because RA's are generally pretty overworked and can outdrink any other on-campus student worker. Also, where do you think all that confiscated booze goes?
There will be an RA Soiree tonight after the freshmen move out. Don't tell the Building Directors!!