What’s in their wallet?

On this Cyber Monday, you can put real money in a really huge wallet and make a really huge difference to causes championed by local and national nonprofit organizations. At today’s Big Skinny Celebration, the Guinness World Records’ “World’s Largest Wallet’’ (21’ X 10’) will be unveiled by the Cambridge-based wallet company Big Skinny. Have your picture taken in front of the wallet and look for it at www.facebook.com/bigskinny. Dancers from the Jose Mateo Ballet Company will perform. Tonight at 6, rain or shine (through the holiday season). Free. Harvard Square T Station, 1400 Massachusetts Ave., Harvard Sq., Cambridge. 617-600-7610. www.bigskinny.net