'She’s Philly through and through, and her take on classic Christmas songs will make for an entertaining night in The Event Center.' 'We’re excited for Aunt Mary Pat’s return to Rivers with her hilarious holiday show this December,' said Justin Moore, general manager of Rivers Casino Philadelphia. That’s not all - Aunt Mary Pat will also perform songs like 'Twas’ the Night Before a Delco Christmas,' 'All I Need for Christmas Is Me,' 'Walking ‘round South Philly Actin’ grand' and more from her holiday album, 'Mary Friggin Christmas.' This wildly popular show will feature Aunt Mary Pat’s powerful punch lines and quick wit. Philly’s favorite aunt, Aunt Mary Pat, is returning to Rivers Casino Philadelphia this December with her hilarious holiday stand-up show in The Event Center on Wednesday, Dec.