Phish's three-day festival this weekend at Watkins Glen International is sold out, the band recently announced.

WATKINS GLEN | Phish’s three-day festival this weekend at Watkins Glen International is sold out, the band recently announced.

The campgrounds open Thursday and Phish fans from all over the U.S. are expected to begin arriving at WGI. The event, called Magnaball, will feature two sets of music by Phish on Friday evening, three sets on Saturday, and two sets on Sunday evening.

The Schuyler County race track draws crowds of more than 90,000 for NASCAR, and Schuyler County issued a permit for Phish with a cap of 60,000.

However, the band’s management decided to cap ticket sales at 30,000, Schuyler County Administrator Tim O’Hearn said.

“The county permit has a 60,000 cap but I don't think they are able to meet health department regs in laying out camping for more than 30K,” O’Hearn said in an email.

Although the show is sold out, the band will offer a live, pay-per-view webcast at livephish.com.

Also, Phish will offer a free radio broadcast of the shows, which will be carried by a local station, WNGZ 104.9, as well as Sirius XM’s Jam On. The radio broadcast can also be streamed from livephish.com.

Phish has staged nine multi-day festivals with camping since 1996 in upstate New York, Maine, Florida, Vermont and California.

The last one, called Superball IX, was hosted by WGI in July 2011. It drew about 30,000 fans, and was the first major concert WGI had hosted since 1973’s Summer Jam, which drew an overwhelming crowd estimated at 600,000 for concerts by The Grateful Dead, The Band and The Allman Brothers Band.