I’m guessing it’s an Irish bar.

From Gothamist

“The Contest” will be held on Saturday, July 20th starting at 5 p.m. at the bar, located at 286 Siegel Street near the Morgan Avenue L train. The event is open to anyone 21 and over; photo and video submissions will not be accepted, no matter how much you want to send them. Oddly, you don’t have to worry about being completely nude, even if you are totally proud of your lilliputian penis: “While nudity is not required, contestants should expect to wear wet underwear (which will be provided).”

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Brooklyn Bar Holding Smallest Penis In Brooklyn Contest: Gothamist.