Damn, you serious? Why is that? What happens on weekends? Are you telling me there's only about 20 ambulances available for Denver?
20? P'shaw. Most nights on weekends there's five to seven city ambulances and roughly four private ones, if that.
That and two police-operated drunk-wagons/paddy-wagons, "Scout 1" and "Scout 2".
I've never counted 20 discreet callsigns on the EMS "frequency". (It's an EDACS system, so it's really a trunk group/ID.) They post them at numbered locations and they all check in on/off post, so tracking isn't too difficult. They do utilize in-vehicle data terminals for some of that admin traffic though, but a written log or a good memory for numbers during a shift-change and you can get a pretty good count as a remote spectator.
Note: This is Denver City & County, not the entire Metro area. Every suburb has their own resources and DIA is far enough out of the city, they have their own Police and EMS out there that don't interact directly with the main District-based dispatch channels.
Downtown Denver in the renovated "Lower Downtown" or "LoDo" (pronounced Low Dough) area is loaded with bars. It's also home to Coors Field and the Pepsi Center isn't far. People go Downtown at night. Denver Center for the Performing Arts and the Denver Convention Center are also packed into that general area, as well as Elitch Gardens. "Upper" Downtown along the 16th Street Pedestrian Mall is also busy with crowds.
Anytime after about 22:00 down there is a mad-house for Public Safety folks.
Denver Health Medical Center goes on "ER Divert" pretty regularly too, adding significantly to run times to go to other hospitals.
The book "The Knife and Gun Club" covers pretty adequately why DHMC (formerly Denver General) is a really good Level 1 trauma facility.
Add a good gang fight to the fray and Denver starts calling in meat-wagons via Mutual Aid with the surrounding suburban districts.
It's entertaing listening, but I'm weird that way. The biggest "aww, bummer" call was the Ambulance that blew a tire two blocks out on a heart-attack call. Sometimes it's just not a good day to have a heart attack.
The second Ambulance didn't call for the Coroner, and they rolled non-emergent to DHMC, so it sounded like the victim was stable. Poor dude.