It may be back to school, but you won’t need any instruction this weekend.

SEE
DC Shorts Film Festival
What: Third annual showcase of local and international mini movies.
Why: Brevity is next to godliness.
When: Thru Sept. 21. See schedule for details.
Where: Landmark’s E Street Cinema, 555 11th St. NW, b/t E & F Sts. (202-393-4266).

HEAR
Open House Arts Festival
What: The Blind Boys of Alabama, Washington Social Club, the National Symphony Orchestra, and 27 others perform for free.
Why: Su casa es su casa.
When: Sat., noon-7 p.m.
Where: The John F. Kennedy Center for the Performing Arts, 2700 F St. NW (202-467-4600).

DO
Greek Festival
What: Dancing, music, and lots of wine.  
Why: Spanakopita, dolmades, baklava. Opa!
When: Fri., 11:30 a.m.-9 p.m.; Sat. & Sun., noon-9 p.m.
Where: Sts. Constantine and Helen Greek Orthodox Church, 4115 16th St. NW, at Upshur St. (202-829-2910).

Toka Gives
What: Salon and spa donates 10 percent of sales to the Cancer Research and Prevention Foundation.
Why: Feel and look good from the inside out.
When: Georgetown, Thurs., 8 a.m.-7:30 p.m.; Penn Quarter, 9 a.m.-7 p.m.
Where: 3251 Prospect St. NW, b/t Wisconsin Ave. & Prospect St. (202-333-5133); 801 Pennsylvania Ave. NW, at D St. (202-628-5133).

BUY
Christmas in September
What: Sidewalk sale of holiday items such as feather wreaths, cards, and whimsical ornaments.
Why: Back to yule.
When: Fri., 9 a.m.-7 p.m.; Sat., 10 a.m.-7 p.m.
Where: Pulp on the Hill, 303 Pennsylvania Ave. SE, at 3rd St. (202-543-1924).