From phish.com: 

Phish will play a special show at Champlain Valley Exposition in Essex Junction, VT next Wednesday, September 14th. The concert will benefit Vermont flood recovery efforts. In the wake of Hurricane Irene, Vermont experienced its worst flooding in a century, which devastated communities throughout the state.

Tickets will go on sale tomorrow, Saturday, September 10th at 10AM ET at The Flynn Theatre Box office (located at 153 Main Street, Burlington, VT). Tickets will NOT be available online. There will be a limit of two tickets per person. Phish asks that you not arrive at the box office until Saturday morning.