This is the programme for an air display called 'London Defended' which was part of the 1925 British Empire Exhibition at Wembley (in Wembley Stadium, in fact, before it became Wembley Stadium). I must admit to having missed this one (and its predecessor in 1924), but it sounds like it was comparable to the longer-lived Hendon pageant. Here's the description from Wikipedia, which is based partly on the above programme (original research much?):
From May 9 to June 1, 1925 No. 32 Squadron RAF flew an air display six nights a week entitled "London Defended" Similar to the display they had done the previous year when the aircraft were painted black it consisted of a night time air display over the Wembley Exhibition flying RAF Sopwith Snipes which were painted red for the display and fitted with white lights on the wings tail and fueselage. The display involved firing blank ammunition into the stadium crowds and dropping pyrotechnics from the aeroplanes to simulate shrapnel from guns on the ground, Explosions on the ground also produced the effect of bombs being dropped into the stadium by the Aeroplanes. One of the Pilots in the display was Flying officer C. W. A. Scott who later became famous for breaking three England Australia solo flight records and winning the MacRobertson Air Race with co-pilot Tom Campbell Black in 1934.
Firing blanks into the crowds -- those were the days!
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