Catherine Andrews contributed to these picks FRIDAY: >> Okay, so it’s not quite as groovy as the sing-along versions that swept the country over the last few years, but if you’re looking for something a little bit fun and a whole lot wholesome tonight, you could do worse than the National Symphony Orchestra accompanying “The Wizard of Oz” on the lawn at the Wolf Trap. 8:30 p.m., $18 to $38. SATURDAY: >> Chopteeth, a…

(By DCist contributor Amadie Hart) Last week, DCist discussed the Wegmans phenomenon, in which otherwise sane and rational people are driving 25-30 miles to shop for groceries in a very cool store. Now, Wegmans has announced the grand opening date of its newest area store, at Fairfax Corner in Virginia. At 7:00 a.m. on Sunday, February 13, the chain will throw open the doors of the store at 11620 Monument Drive in Fairfax, bringing organic…