Twickenham UK similar to the comment about Michael Jackson but it was Prince. Came with an entourage, had his own personal attendant to look after him (my uncle) every time he went anywhere they had to radio control to let them know he was on the move using code name 'purple rain' (you can't make this stuff up)!! So much for all being equal!!
Best memory was twickenham about 1975 when I managed to get lost, lost and found gave me orange juice and biscuits, took ages for my mum to come get me. Worst was the toilets, some were dustbins with lids on, they stank.