FRIDAY: The Mozart Year is almost halfway over — the man’s birthday was January 27 — but classical concert programming continues to celebrate it. Opera Lafayette gets in the game tonight and tomorrow (June 2 and 3, 7:30 p.m.) with a concert performance of Mozart’s first important opera, Idomeneo, at the Clarice Smith Performing Arts Center in College Park. The vocal cast promises to be excellent, including an up-and-coming young singer named Millicent Scarlett, who…