The second annual ‘Tree Lighting Ceremony’ of the 36′ tree at the Cosmopolitan happens tomorrow night at 7 pm and the event is free. Scheduled to host the event is Vegas Golden Knights defensemen Deryk Engelland. The event should help you get in the Christmas mood and after watching the ceremony you can check out the free winter wonderland around the Ice Rink or even skate at the rink for a fee.