According to an Instagram post from a concertgoer (below), actor Ricky Schroder ( Silver Spoons, NYPD Blue) was among the protesters. On Sunday, when tickets went on sale for the show, Schroder took to Facebook to speak out against the event's vaccine requirement. "Dave Grohl is an ignorant punk who needs slapped for supporting Discrimination," the post reads. "Ignorance comes in all shapes & sizes. Kurt Cobain is laughing at you Dave along with Millions of Patriots....Fool." Billboard has reached out to a rep for the actor to confirm his attendance on Tuesday and hadn't heard back at press time. For his part, Canyon Club owner Lance Sterling was unbothered by the protesters when