I went to this same beerfest recently and it was twice as big. Good experience. Denver is a great place. Very underrated city and state in terms of local breweries, and some quality outdoors/hiking areas that put other states to shame. I live south of Denver in CO Springs and Demarcus Ware often hikes and visits some of our hot spots, I just happen to JUST miss him.
Each city has it's own vibes. Boulder, Fort Collins, and Denver are all very unique from each other. Then you have the ski cities as well.