The Gore Hotel in Kensington, London, was the site of the real “beggars banquet” held in celebration of the release of the BEGGARS BANQUET album. The bash cost over £1,000 and ended with the Stones throwing custard pies in the faces of Decca Record executives (who had caused the LP’s late release), and in other guests.
From the Let It Bleed 50 site:
A press reception for The Rolling Stones Beggars Banquet is held at The Gore Hotel in London. The Stones held a rambunctious release party for the album at the elegant and historic Gore Hotel in London. Initially, the band wanted to launch the album with a party at the Tower of London but with that historic venue unavailable they opted to go the Elizabethan room of the hotel. The band, dressed as beggars, and their VIP media guests sat down in candlelight to be served a seven-course dinner by a coterie of corset-busting serving wenches. At some point during dessert, a visibly jolly Jagger decided to revel in a little slapstick and kicked off a huge food fight by smacking Jones in the face with a custard pie.