Coco-Cola Collectors Convention. 10 a.m.-9 p.m. Hyatt Regency Reston, 1800 Presidents St., Reston. Bring Coca Cola collectibles and have them appraised. Swap with other collectors. Live auction. The convention's Saturday swap meet on July 9 is open to the general public. Free. cocacolaclub.org. 214-929-0555.
Amphibians After Dark. Lake Fairfax Park, 1400 Lake Fairfax Drive, Reston. Assist park naturalists with a calling amphibian survey. Learn how to identify frogs and toads by their calls as we explore pools and ponds. Children must be accompanied by an adult registered in the program. $6/$8. http://www.fairfaxcounty.gov/parks/lakefairfax/.
"Ferris Bueller's Day Off." Sundown. 11404 Washington Plaza W, Reston. Part of Lake Anne Summer Film Festival. Free. lakeanneplaza.com.
Guerrilla Theatre Works: At What Cost? 8 p.m. NextStop Theatre, 269 Sunset Park Drive, Herndon. $20. One night only events featuring various genres of performance. nextstoptheatre.org.
Kristen and the Noise Concert. 6:30-10:30 p.m. Town Green, 777 Lynn St., Herndon. Come hear the band Kristen and the Noise in concert. Free. firstname.lastname@example.org.
Senior Tea. 10:30 a.m.-noon. ArtSpace Herndon, 750 Center St. Herndon. All teas are free and open to the public. 703-956-9560. artspaceherndon.com.
Ukulele Festival. 10-6 p.m. Lake Anne Plaza, 1609 Washington Plaza, Reston. free festival features performances by several acclaimed ukulele musicians, music demonstrations, a public morning jam session, festival vendors, and other family friendly activities. Free. lakeanneplaza.com.
Meadow Explorers. 9 a.m. Lake Fairfax Park, 1400 Lake Fairfax Drive, Reston.Enjoy a hike to our Wildlife Sanctuary meadow in hopes of seeing various animals the call our meadow home, while learning about the wildlife habitat. Bring footwear suitable for hiking. $10/$12. http://www.fairfaxcounty.gov/parks/lakefairfax/.
Herndon Town Calendar Photography Reception. 7-9 p.m. ArtSpace Herndon, 750 Center St. Herndon. 703-956-9560. artspaceherndon.com.
Sunday Afternoon Dance. 2:30-4:30 p.m. Reston Community Center, 2310 Colts Neck Road, Reston. Dancers of all skill levels are welcome to foxtrot, swing, cha-cha, and waltz. Music from golden oldies to modern dance selections, door prizes and light refreshments add to the fun. 55+. http://www.restoncommunitycenter.com/