With the bands touring equipment likely sitting somewhere on the east coast of the US - ready to head to Europe in late September to begin the European leg of the Unleashed Tour, it's probably easy for them to pull off this Charity gig on August 29th.
From Hamptons Magazine:
"Finally, this marks the 25th anniversary—and the last summer—of the famed Huggy Bear tennis tournament that Teddy Forstmann started in honor of his brother, Nick. Don’t miss the exhibition match with the top two doubles teams in the world, Mike and Bob Bryan and Nenad Zimonjic and Daniel Nestor, and the party finale on August 29 with a performance by Fleetwood Mac. For ticket information call Julia Harris at 212-627-0578. Proceeds go to Keep a Child Alive and the Southampton Fresh Air Home".