Saturday event featured employers like Ameren, Hollywood Casino, and IKEA.
Lead singer Axl Rose dove into the crowd at a fan to take away his camera.
Hollywood Casino takes over naming rights for the old Riverport Amphitheater in Maryland Heights.
49,000 remained without electricity Sunday evening.
Waves of rough weather spawning high winds and a tornado tore through eastern Missouri and the St. Louis area Friday night, downing trees and power lines and sending gamblers rushing from a casino floor.