Went to watch the Denver Roller Dolls roller derby last night. Pretty good time for the money. It was held at the 1stbankcenter arena.
http://1stbankcenter.com/
http://1stbankcenter.com/policies/

They were inspecting bags, Broomfield PD was present, but it doesn't appear there are rules on CCW. No detectors, no wanding etc. I didn't ask, nor did I CCW.

FYI for future visits.