Rent or buy a Jockey Box w\ Co2 you wont be disappointed beats having to pump the keg. you can hide the kegs behind a table then dress the coolers up to not look like your at a keg party
get it cold and let it sit preferrably the day before if possible, dont move or disturb right before pouring. Also keeping the lines cold helps a lot with foam. also are you pouring with CO2 or the pump? I would go CO2 with regulator if you can get your hands on a set up.