The party takes place on Wednesday, June 4, at the roof-top venue, which is a short walk from the Kensington Olympia, where the three-day fair takes place.
The party runs from 7pm to 1am and has capacity for 500 guests, with tickets selling for £45.
Entertainment will include a barbeque, disco and a selection of wines, beers and spirits.
All proceeds from the event will go directly towards helping vulnerable members of the trade facing medical or financial hardship.
David Cox, The Benevolent’s chief executive, said: “So many members of our trade love to party and we believe our party will become the talk of the town.”