I enjoyed last year's America on Tap Beer Festival enough that I decided to go back again this year.
America on Tap folks know how to organize this kind of event, in start contrast to the terribly organized Tots and Beer event that I went to earlier this summer. No long lines for beer - I think the longest I had to wait was just a couple of minutes. Around 3 dozen different breweries represented, with plenty of space under a couple of long tents. Live music and several food carts if you'd like a snack. My only complaint was that they only had a couple of people checking IDs at the entrance, but once you got inside everything was set up well.
As long as this festival is making stops in Grand Rapids, I'll try to make it out. Good fun with a friend or two, and plenty of excellent beverages to try.