Yes, I was at Twickenham, England and the Velodromo Vigoralle in Milan, Italy. I was 15 and it was an amazing immersive experience. Looking back it was cult conditioning central and it worked. I remember thinking that the world outside was just a faded reality and the life amongst all these people was the real thing. I remember thinkingt "this is wonderful" but had nagging doubts "but is it true?" I decided to swallow the doubt, aaaggggh.
The infamous "Babylon" book was released, a source of torment for years after.
Personally, I was 15 and there were more girls around than I had ever seen so I was in a hormone bubble of youthful temptation and repression not helped by a journey across Europe staying with at least one family with a lovely daughter before being whisked onwards.
The experiences to a young mind were rich and forming. The people, especially in Italy were amazing. The emotional impact vey real without apparent hypocrisy.
Little wonder that it set me back years in allowing the unanswered questions to reemerge. All that glitters is not gold.