NICKELODEON STARS AT NYC PLAYGROUND TODAY Miranda Cosgrove of "iCarly," Victoria Justice of "Victorious" and Keke Palmer of "True Jackson, VP" are among the participants in Saturday's Big Brothers Big Sisters event Race for the Kids, starting at 10 a.m. at Manhattan's Riverside Park (at 72nd Street). It's part of Nickelodeon's seventh annual Worldwide Day of Play, during which the channel and its websites go dark from noon to 3 p.m. to encourage kids to get active. More at raceforthekids.org.

'DWTS' EXTRAS Go backstage with "Dancing With the Stars" and chat with the competitors through online features new this season. Live chats among fans run Monday night from ABC's 8 p.m. East Coast feed of the show through the 1 a.m. ET end of the West Coast feed. There's also the Web's "Backstage at Dancing With the Stars" with host Sabrina Bryan, posted Wednesday mornings following Tuesday's results show. Full episodes now stream, too, at abc.com/dancing.

CASH FOR YOUNG ENTREPRENEURS The 2010 Movers & Changers competition, sponsored by mtvU and the New York Stock Exchange, will award $25,000 in start-up money to college students ages 16-28 with innovative business ideas using social media as a marketing tool. Individuals or teams of up to three people are invited to submit a video "elevator pitch" by Oct. 8. Visit mtvu.com/shows.

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