I should call my friend who is the Director of Operations for Invesco Field...he would know.
I drove past the intersection of 1-25 and Speer Blvd. the other day and got a few more names of hotels there for anyone who needs them. You can walk to the stadium from there. There's a Residence Inn, a Budget Inn, Hampden Inn, and Ramada. They are also just a short cab ride (maybe $10 max) from LoDo and Larimer Square...which are fun places for eating/drinking.
I have a reservation at the Residence Inn, because it looked like it was within walking distance, but I was wondering whether it would be safe to walk back to the hotel from the stadium after the concert. Is the neighborhood OK? I assume there'd be a bunch of people walking back, but wanted to know if you know anything about the surrounding area. Thanks.