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Four stars from the “Brady Bunch” – the three boys and Cindy – will reunite tonight at the World’s Largest Disco.

Barry Williams, Chris Knight, Mike Lookinland and Susan Olsen – Greg, Peter, Bobby and Cindy – will join partiers at the 20th anniversary bash tonight at the Convention Center.

Disco queen Gloria Gaynor, known for her hits, “I Will Survive” and “Never Can Say Goodbye,” will be the musical guest.

This is her second time performing at the event. Her first was in 1979, the first year the World’s Largest Disco was held in Buffalo.

Other celebrity guests tonight will include Kristy McNichol, who starred as Buddy Lawrence on “Family” in the 1970s. Her brother Jimmy McNichol, who played Jack Fitzpatrick on “The Fitzpatricks” and Vincent Butler on “California Fever” will also be at the disco.

Deney Terrio, the host of the TV show “Dance Fever,” will join the party as well. Terrio is credited with teaching John Travolta how to dance for his role in “Saturday Night Fever.”

Rounding out the line-up is Lawrence Hilton-Jacobs, a singer and actor who played Freddie “Boom Boom” Washington on the show “Welcome Back Kotter.”

The World’s Largest Disco was one of the first events held in the Buffalo Convention Center in September 1979, featuring Gloria Gaynor and the Trammps. Fifteen years later, Dave Pietrowski asked the promoters of that event if he could use that name to hold a charity event.

In 1994, 1,800 people attended.

The next year, 4,000 people came.

The year after that, 6,000 people came.

In 1997, 11,000 people crammed into the Convention Center for the disco. After that, organizers agreed it was best to cap attendance at 7,000. It has sold out for the past 15 years.

All of the proceeds benefit Camp Good Days and Special Times.

For more information, go to www.worldslargestdisco.com.