Retro music can send listeners back in time without the risk of changing the future or accidentally dating your parents. Melodically transcend dimensions with today's Groupon: for $22, you get two general-admission tickets to the Retro Beach Bash at Carlos'n Charlie's on Saturday, June 11 (a $45 value).

Retro Beach Bash rouses concertgoers outside on the beach of Lake Travis with interactive competitions and nostalgic tunes performed by Billboard musicians from the 1970s and '80s. Concerts kick off at 2 p.m. on the sandy stage behind Carlos'n Charlie's and continues until 10 p.m., well after the sun hides behind the horizon to give Australians sunburns. Crowds will groove along to performances from soulful artists, including Ambrosia, John Ford Coley, and Terry Sylvester of The Hollies. The circle-twirling duo of SpunShine will lead a hula-hoop contest in the afternoon, and a retro beachwear competition will parade participants who sport bell-bottomed wetsuits and tie-dyed water wings.

Kick up sand and buried memories of feathered bangs with outdoor euphony next to the water, or lounge on the restaurant's breezy deck as oldies swell from the indoor stage. Fun lovers of all ages can attend the event, and a portion of the proceeds will benefit SafePlace, a charity for victims of sexual abuse and domestic violence.