Some additional thoughts on this for the organizers:
1) Have more adult beverage options spread around than just the beer and wine tents. Yes, I know Karbach had their own tent, and it appeared some places were selling wine slushies. The problem is that you want people to wander around and check out all the various crafts, businesses in downtown Bryan, etc., but when it is a 10 or 15 minute walk back to the beer/wine tents every time you need a refill, it is a real pain.
2) Encourage beer/wine vendors to make it very clear what they have on offer. Some of them are good about this with signs up on their table listing what they have, its attributes, etc. But, some of them didn't do this, and for that reason I believe mostly got passed by.
3) Do something about having the children's play area right next to one of the big stages. Or, do something about the sound level of that stage. When even the kids are putting their hands over their ears because the music hurts, it is too loud. We would have done more train rides and bounce house time if some band hadn't started absolutely blasting out the decibels.
4) If you don't change it a few weeks later to a cooler time, set up more of the big cooling fans. You had one about 50 feet from the bounce houses. It didn't do any good for the bounce houses, but at least kids (and their weary parents) could walk over to it and cool down every once in a while. If you are going to keep the festival on its current weekend, you need many more of these set up at various points around the festival.
5) Make your pricing more transparent. I was surprised to find several "special" beers required 10 tickets instead of 5 like I thought I saw online. Maybe I didn't read carefully enough. $10 beers are special indeed -- perhaps encourage vendors not to go that route even for their "special" brews.
6) Give a plastic glass option. Yes, the real glasses are nice. They break real nice too, and we encountered multiple places with shards of broken glass as a result, including in the middle of the bounce house area. At least let people choose, and perhaps even give a price break for the plastic to encourage safety. Trying to walk around with a wine glass in one hand and a wiggling 2-and-a-half year old in the other is a recipe for disaster.