FRIDAY: >> RJD2 is not to be confused with the new R2D2 mailboxes unvelied this month. His turntable skills, however, have us wondering if he’s part robot. At the 9:30 Club, $20. >> Native sons The Walkmen, who we talked to last spring, bring their boozey, jangley rock, to the Rock & Roll Hotel tonight. Fans can look forward to hearing lots of new material that the band’s been road-testing this spring. If you liked…