Alright, so, when I say circuits, I mean like every breaker is its own circuit. So if you look in you're breaker box at home, you'll see like kitchen room 1 office etc, and that means its has its own circuit. All of those receptacles fall under the one circuit (i.e. all the receptacles in the office belong to one circuit.) So lf I were you I would go find your 2 or 3 30 amp breakers find out what rooms they are and run cords into wherever this party is going.
Addressing what rusticles said, sometimes lower amperage breakers can pull some more current, but that is pretty stupid to do, especially if you know you are doing it. Depending on the electrician and how tidy his work is, you just really never know because he's the only one who see's it. Don't take chances with it, and as far as him saying the breaker will flip, don't assume anything. Most electrical fires start due to poor joints, or nicks in cable or some other dumb shit. I've seen low voltage commercial grade transformers short and not kick the breaker (an electrician I was with had the heads up to hit it pretty much instantly) in the high voltage panel its being fed from.
Do your house a favor, use the higher breaker. Oh and don't spill mountain dew on the surge protector.