Another huge outdoor stadium concert in London's Wembley Stadium, but this was a fairly rare event inasmuch as it featured a bevy of infrequently seen West coast superstars who managed to attract a laid back crowd of around 80,000 ( some sources say 72,000 ) , largely due to the fact that Crosby Stills Nash and Young had finally reformed , so this show would be their first in the UK since 1970. As the band had an " on ,off " reputation , nobody knew just how long the reunion would actually last (the group would disband again for some time after this 1974 stint ) so the impetus was there to attend if you were any sort of fan .