Following the logic of festival posters, a nice mix of garage-tinged pop and indie electro dance jams makes up the undercard, including psych-poppers Vacation Club, dark electro-dance group Drew Price's Bermuda Triangle and Cream favorites Music Band; Music City rawk ambassadors JEFF the Brotherhood, Miami garage all-stars Jacuzzi Boys and our own country punks Natural Child top the bill.
Prior Happenin Fests (including last year's) were held in Huntsville, but this time around it moves a couple of hours south to the indoor stage at Birmingham's Good People Brewing Company. (Side note: They make a nice IPA, which is the only beer I know of that comes in cans from an independent brewery. Feel free to correct me in the comments.) The one-day, 21-and-up festival starts at 3 p.m., and a ticket will only set you back 10 bucks.
If you want to make a weekend of it, you could always tour the Sloss Furnaces, check out the Barber Motor Museum or visit the Alabama Jazz Hall of Fame, which is coincidentally celebrating Sun Ra's 100th birthday that weekend. One thing you unfortunately can't do is stop at Pete's Famous Hot Dogs (RIP, Gus).