+1 for HBHQ. It's the closest one for me and they are incredibly knowledgeable and friendly. I went to the Winemaker Toy Store once because I happened to be in the area, but I wasn't too impressed but it could have been that one time. I've also heard good things about Stubby's Texas Brewing Inc. in Fort Worth.
Homebrew festival -wise, keep an eye out for Labor of Love hosted by Deep Ellum Brewing Company and Brew Riot in the Bishop Arts District.
You also have Big Texas Beer Fest, Untapped, Best Little Brewfest in Texas, and North Texas Beer Festival for your commercial beer festivals.
Welcome to Texas! You're gonna love it.