A Renaissance Faire is a lively medieval-themed event, typically held outdoors. "Its partly a craft fair, its partly historical reenactment, its partly performance art. Everyone working at Faire dresses in costumes (or garb) typical of the late Elizabethan period. There are many booths selling both crafts and food. Parades wind their way through the crowds. Jugglers, musicians, magicians, and other entertainers perform through the day. You wander about, examining goods for sale, sampling foods, watching plays and performers, and of course drinking fyne English Ale ..." (from the Ren Faire homepage).
The Renaissance Faire the boys attended in the early part of the summer of 2008 was probably the Renaissance Pleasure Faire which takes place in May in Irvindale, which is only a dozen miles from Pasadena.