FRIDAY: >> DCist Exposed opening reception, OBVS. 6:30 – 9:30 p.m., at Warehouse. >> If you’re looking for more hip art happenings afterward, head over to the Hirshhorn After Hours party, which goes until midnight. It’s a celebration of the opening of Virgil Marti and Pae White’s new site-specific installation in the Hirshhorn lobby, which is the latest in the museum’s Directions series. Ian Svenonius is spinning and it looks like there’ll be a number…