There is shopping for "the woman" If you can find someone with a pass, there is a huge Marketplace going on in Denver during the stockshow. If she just wants to ignore the cattle show portion of Denver, there are some cool malls, like Flat Irons, that she can wonder. Can always go to "Low Do" the lower district part of Denver. Fun times.
Most of the hotels on Quebec have a shuttle. There are a few that offer happy hour, but they are back on Peoria I believe.
Layers are a must! Sat around with everyone in the displays one day, drinking in the amazing sun, listening to live music..... waddled up to the Hill, drank and chatted up there only to come out to snow. Enough to do snow angels in, but that is another story
If you get too cold, there is always football in the yards bar.
Elway's is a decent, super priced steak. There is some pretty good Mexican food in Denver. Can't think of the place off the top of my head.
You will have a blast. Wouldn't miss this show for the world.