Do we need some formal letter from the club to collect the tickets ?
You should get a postcard that's been torn in half. You get one half then have to match it up with the one held by a guy carrying a copy of The Racing Pigeon Gazette under his left arm and wearing a brown trilby, who you'll meet at a secret location. He will give you a secret question and answer that you can't write down and have to remember.
When you're in Paris, someone will sidle up unobtrusively at some point and ask you the secret question. You have to give him the right answer. If you do he'll give you your next instructions, which will be to follow someone "E.g. "Follow that man in the red trousers.". At some point, the person you're following will go down a narrow alley and into a dark passage. As you follow them, you'll be stopped by a couple of guys you wouldn't want to meet on a dark night. They'll make sure you haven't been followed, blindfold you, then lead you to the collection point.
Still blindfolded, you'll be fingerprinted, asked some questions, which start off easy (Name, date of birth) then get more personal, with questions only you would know the answer to. If they're happy, you'll be taken, still blindfolded, dumped in the back of a van and driven around for a while until you're completely disoriented. Then the van will stop, you'll be dragged out, the blindfold removed and you'll be handed your ticket.
Quite straightforward really.