Judges Ted Leonsis, Aneesh Chopra, Rep. Gerry Connolly and Mark Gruhin will choose a winning company for the yearlong startup competition. Registration is $49, includes an open bar, and the deadline to register is midnight.
Light Up Rosslyn Under the WJLA Jumbotron (1100 Wilson Blvd) Time: 5:30 to 6:30 p.m.
The Rosslyn BID hosts its annual holiday lighting ceremony. The hourlong event features a winter clothing drive, free food and drink and local speakers giving speeches.
Volunteers can help regional park staff gather insects and worms to feed animals at the Nature Center, particularly the captive turtles. A $5 donation is requested and attendees can call 703-528-5406 to make a reservation.
The outdoor ice rink — now Northern Virginia’s largest — hosts its grand re-opening in time for the holidays. There will be a DJ, a s’mores station to benefit a Girl Scouts troop and a surprise performance at 8:00 p.m.
The National Chamber Ensemble celebrates the holiday season with a selection of holiday music like “Sleigh Ride,” Chanukah songs and pieces by Tchaikovsky and others. Tickets are $30 for adults and $15 for students.