I’m surprised that old barn is still standing if it’s the Denver Coliseum I remember.
Its the one you remember. Built like a World War II era hanger, and with all the charm of same, it is still used even though there are newer, bigger, and nicer places. The annual stock show is the big event there.
I was at the Denver Coliseum today at 11:30 am buying tickets for a Red Rocks concert. The motorcycles were all immediately north at the Western Stock show area. Huge bikes. Loud engine noise. Some were wearing matching shirts...50 or more walking single file towards the Stock Show area which is north of the above I-70 overpass. Coliseum is south of the overpass. Bikers 50 yards away. Going to see Big Head Todd with Dwight Yocum June 11. Everything orderly while I was there.