Greenbelt Labor Day festival, with Miss Greenbelt pageant, talent show, live music, carnival rides and games, art show, food and more. 9:30 a.m.-11 p.m. Friday-Saturday, Roosevelt Center, Crescent and Southway Roads. Admission free. Tickets $1/each; 25 tickets for $20 or unlimited ride wristband for $20. Linda Ivy at 301-675-0585.
D.C. Blues Festival, If it’s the Saturday before Labor Day, it’s time for the D.C. Blues Festival. Now in its 23rd year, the noon to 7:30 p.m. bill features the players of the D.C. Blues Society Band and performances by Preston Shannon, Grady Champion, Anthony “Swamp Dog” Clark, Nadine Rae and the Allstars and others. Meanwhile, a side stage offers guitar, harmonica and vocal workshops and an instrument petting zoo for children. Carter Barron Amphitheatre, 4850 Colorado Ave. NW. Free. Tickets, 202-397-7328; information, 202-426-0486 or www.dcblues.org.To submit an event
Mail: Root DC Live Calendar, The Washington Post, 9500 Arena Dr., Suite 400, Largo, Md. 20774.
Details: Announcements accepted on a space-available basis from public and nonprofit organizations only. Include dates, times, exact address, prices and a publishable contact phone number.