Phillip Chapman Lesh will celebrate his 71st birthday this evening in New York City. Furthur has created a special poster to commemorate the event, which it place on sale this evening at the Best Buy Theater. Special guests are expected to perform with the group as well, to mark the occasion. For a look at Warren Haynes’ guest stint with Phil Lesh and Furthur on Sunday night, check out Dino Perrucci’s photos on Relix.com.