'SING-OFF' AUDITIONS Local a cappella groups can try out for the third season of NBC's "The Sing-Off," when casting comes to Manhattan next Saturday, at SIR Studios, 520 W. 25th St. Line starts at 8 a.m., doors open 9 a.m. Details at singoffcasting.com.
QUIZ ASTRONAUTS IN SPACE PBS' "NewsHour" is teaming up with Google and YouTube to let viewers ask questions of astronauts aboard the space shuttle Endeavour Monday at 2:15 p.m. Submit a text or video question now (before tonight at 11:59) at pbs.org/newshour.
CMT MUSIC AWARDS It's time for final voting in the 2011 honors to be handed out June 8. Nominations are led by Jason Aldean, Lady Antebellum, Miranda Lambert, Rascal Flatts, Taylor Swift, The Band Perry and Zac Brown Band. Cast your vote now (through June 7) at