Tommy Castro performs at Green Flash in 2010. Wednesdays: May 18, June 15, July 20, Aug. 17, Sept. 21 6-9 p.m., Ages 21+ General admission: $25 with RSVP ($120 season pass), $30 at the door Tickets on sale now! RSVP: 858-534-4109 Enjoy a rockin' sunset this summer at the sixth annual Green Flash Concert Series at Birch Aquarium at Scripps Institution of Oceanography, UC San Diego. These unique monthly concerts - co-hosted by 102.1 FM KPRi - are held from 6-9 p.m. for music lovers ages 21 and older. Proceeds support exhibits and educational programming at Birch Aquarium at Scripps. The concert series, which kicks off May 18, combines live music with panoramic ocean views on the aquarium's stunning outdoor tide-pool plaza. Savory happy-hour appetizers, craft beers and wines are available for purchase. Keep an eye out for a real "green flash," a rare optical phenomenon caused by refraction of light as the sun sets on the horizon. All concerts are standing-room only. Discounts for season passes and Birch Aquarium members are available. Admission includes the concert, entrance to all aquarium exhibits and parking. Wednesday, May 18 Performer: EARL THOMAS & THE BLUES AMBASSADORS Earl Thomas is a showman and a San Diego favorite whose fans have been asking us to bring him here for a Green Flash concert. His band combines traditional and contemporary blues with a little rock, a little soul and a little funk to create a sound uniquely their own. Wednesday, June 15 Performer: DONAVON FRANKENREITER A love of life, the ocean and San Diego brings surf rocker Donavon Frankenreiter to town for his first Green Flash appearance. Performing with his full band, get ready for an evening of musical adventure and plenty of good vibes. Fitz & the Tantrums Wednesday, July 20 Performer: FITZ & THE TANTRUMS So how did Indie pop phenom FATT make it from living room to main stage within a year? Six killer musicians, five dapper suits, irresistible songs and a dash of serendipity. This is the Green Flash debut for these soul-clapping, get-down-on-the-floor, moneymaker shakers. Wednesday, August 17 Performer: STEVE POLTZ We just can't seem to get enough of this guy. Playful singer-songwriter and San Diego legend Steve Poltz returns for a clever, creative and fun-filled evening. Always quirky and unpredictable. Wednesday: Sept. 21 Performer: BRETT DENNEN Brett has headlined every major city in the United States, Europe and Australia and has been hand-picked as an artist to watch by a "who's who" of his contemporaries, including John Mayer, Jason Mraz, Dave Matthews and O.A.R. This is a must see show. About Birch Aquarium at Scripps Birch Aquarium at Scripps is the public exploration center for the world-renowned Scripps Institution of Oceanography at UC San Diego. Perched on a bluff overlooking the Pacific Ocean, the aquarium features more than 60 habitats of fish and invertebrates from the cold waters of the Pacific Northwest to the tropical waters of Mexico and the Caribbean. An interactive museum showcases research discoveries by Scripps scientists on climate, earth and ocean science. Accredited by the Association of Zoos and Aquariums, Birch Aquarium welcomes an annual attendance of more than 410,000, including 45,000 school children. Location: 2300 Expedition Way, La Jolla, Calif. Phone: 858-534-FISH Hours: 9 a.m.-5 p.m. daily Directions: From Interstate 5, exit at La Jolla Village Drive. West one mile. Left on Expedition Way. Parking: Birch Aquarium offers three-hour courtesy parking.