K.C.
My friend recently did a lego birthday for her son. They just rented the community room at a local park and decorated it with all kinds of cute lego stuff. it turned out really well.
they also had a Lego guy come. He brought tons of Legos and different things to do with them - a racetrack and pieces to make cars, a pre-built city with other pieces to add on, a lego soccer game, etc.