THINGS TO DO

Orange Crush Demolition Derby

Those seeking true knockabout entertainment can head to the seventh annual Orange Crush Demolition Derby at the OC Register Arena. In this event, held at 3 and 8 p.m. today, drivers will ram each other until only one car is left running. The show is free with regular fair admission.

Peking Acrobats

There are few things more hair-raising than watching a man balance upside down on one hand on top of a 20-foot stack of chairs. For the Peking Acrobats, though, it’s all in a day’s work. The Chinese troupe visits the fair regularly to juggle, ride unicycles, turn flips and, in general, defy the laws of physics. Shows are 5, 7 and 9 p.m. daily on the Plaza Arts Stage.

Earth, Wind and Fire

“Shining Star,” “September,” “Sing a Song” — this Chicago funk band’s many hits are familiar to anyone who regularly listens to oldies radio. The groove will begin at 7 p.m. today at the Pacific Amphitheatre, with tickets ranging from $29.50 to $65.