Concerts, like dimly lit chandeliers, are more impressive outdoors and more enchanting when adorned with strategically placed glow sticks. Experience the improvement open air brings with today's Groupon: for $11, you get a weekend pass (up to a suggested donation value of $10), plus two beer tickets (a $12 value), to the Green Music Fest, held on Saturday, June 25, and Sunday, June 26 from noon to 10 p.m. (up to a $22 total value). The festival will take place in Wicker Park on Damen Avenue between North Avenue and Schiller Street.

The Green Music Fest answers hankerings for eco-friendly outdoor entertainment with a two-day extravaganza of music, green product vendors, and craft beers. Bands lined up by Subterranean, including Les Savy Fav, Yo La Tengo, and The Thermals, drown out summer doldrums and the ice-cream truck’s endless renditions of “Turkey in the Straw” with ear-pleasing aural waves. Tech buffs and tree-lovers can join forces to ooh and aah their way through the green vendor village’s surfeit of solar-powered devices, recycled products, and locally manufactured goods; young sprouts will be transfixed by arts and crafts stations and puppet shows. Trade in drink tickets at the craft beer station for brews from New Belgium and Sierra Nevada to wet palates parched from working on a tongue-tan all weekend.