Anyone who’s been to Johnny's Hideaway knows a big part of the Atlanta nightspot’s popularity and multi-generational appeal is due to the skills and sounds of Jack Pena, known as DJ Happy Jack among his devoted fans. The longtime disc jockey, who has been spinning tunes at this Buckhead institution for more than 20 years, is now battling cancer, and Johnny’s is hosting a fundraiser in his honor on Thursday, July 11. Twenty percent of all sales on this day will go toward Pena’s medical expenses, so gather up your friends and make a plan to party with a purpose. Can’t make it? Donate directly via Go Fund Me.