City nightlife is not reserved just for the Gaslamp District. Have you visited Balboa Park lately? Maybe the activity is a mite tamer, but since mid-June the cultural center has turned on the lights and opened its doors to nocturnal demonstrations and pageantry. Twilight in the Park kicked-off its live music series on June 16 and included the popular 23rd annual organ presentations on Mondays. Visitors will have a wide choice of programs, ranging from military bands, Dixieland jazz, big band swing and Latin salsa at the majestic Spreckels Organ Pavilion. Musical entertainment will run through Aug. 27 on Tuesday, Wednesday and Thursday evenings, 6:15 to 7:15 p.m. Hours will be extended at the San Diego Natural History Museum for its exhibitions, Sundays through Thursdays until 7 p.m. and Fridays and Saturdays until 9:30 p.m. They’ll leave the lights on at the San Diego Museum of Art and Museum of Photographic Arts Thursday nights until 9 p.m. Up ahead, San Diego Museum of Art’s Screen on the Green returns on July 24 with a selection of free films. Dates are July 24, July 30 and Aug. 6. Screen on the Green movies begin at 8 p.m. on the east lawn. Kick-off night (July 24) will feature a Comic-Con special with selections of animated and live action short films: “Once Upon a Tide,” “Abridged Iz–the Spirit of Aloha” and “Karma Café.” “The Adventures of Baron Munchausen” is set for July 30 and “Shadow Magic” on Aug. 6. The Old Globe’s popular Summer Shakespeare Festival will present three plays performed in rotation, running through Sept. 27. There will be two Shakespeare productions: “Twelfth Night” and “Coriolanus,” along with Edmond Rostand’s celebrated classic “Cyrano de Bergerac.” All performances are under the stars in the outdoor Lowell Davies Festival Theater. Nighttime Zoo, the San Diego Zoo’s summer adventure, runs through Sept. 7. Summer hours are 9 a.m. to 8 p.m. And, the flight pattern stop-action Starlight Theater will offer musical favorites for the warm summer nights. Starlight Theater recently announced its show selections for the 2010 season. The shows that will be featured are “The Pajama Game,” July 15-Aug. 1, and “Hello Dolly!” Aug. 19- Sept. 6. Meanwhile, go indoors to see the stars at the Reuben H. Fleet Science Center with its “The Sky Tonight Planetarium Shows.” That’s the first Wednesday of the month at 7 and 8 p.m. in the Center’s Heikoff Dome Theater. Tickets are limited to 250 patrons. IMAX’s new presentation “The Ultimate Wave Tahiti” opens today, July 1. It follows nine-time world champion surfer Kelly Slater and Tahitian surfer Raimana Van Bastolaer as they explore the ultimate wave-riding experience at the famed Pacific surf site of Teahupo’o, Tahiti.