You will of course recognise all or most of the people in the picture but can anyone tell me where it was taken?  BD 86 on the t-shirts is a clue but not enough to help me to recall in which town/country this photograph by Patrick Anderson was taken. Can you help? 
Had thought this site would be supplying answers rather than questions but nobody’s perfect.

03/10/2022

Just learned - it was a 1986 convention at Sierre in the Swiss alps.

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