Merrill Auditorium, 20 Myrtle St., Portland, $67-$173. There’s still a few tickets left to see comic Kevin James when his Owls Don’t Walk tour comes to Portland on Friday. Flat track roller derby is exciting and competitive to watch as the lead jammer racks up points while whizzing around the track. The Hill Arts, 76 Congress St., Portland, $55-$75. Aura, 121 Center St., Portland, $49.50- $89.50, 18-plus.