|Date:||July 19, 1971|
Above is an ad for Queen's fourth gig with John Deacon on board.
The ad doesn't specify a date (they played at the same venue two weeks later), but to confirm the date, here is an ad for the Status Quo show a few days earlier, taken from a Status Quo website.
The "LP soon for release" mentioned in the ad was far from ready to release. The band hadn't even recorded a demo yet.