Yesterday I couldn't catch sleep and eventually I thought about this weird pickup idea.

I guess doing it wrong could be quiet creepy and weird, but done right, with a good amount of confidence and cool friends/wingmen, interesting and atleast entertaining.

So this is the situation, you're at a festival or public place. You and your friends get bored. You approach a set and you tell them a guy is going to approach them and seduce them. As your friend comes up to them, you describe the way he walks, and how he'll try to get into their group or single girl.

this is where I doubt is it better to start explaining them what he'll do beforehand or afterwards

The guy performs a routine, and you point out what he's doing, how he's doing it and how it should affect them. You could even throw in someone (an attractive girl or confident guy), who's going to say hello to the guy performing his routine, to show soical validation etc. even if you've asked them to do that. And you'll tell them you asked that girl or guy. You explain how he does kino, gave himself a time boundary, asks them to do a favour for him and all the other things you've learned, while practicing seduction.

The basic concept is quiet clear, . But should you explain everything beforehand and leave or stay (could be creepy if you've told them everything, or you could behave like a friend of theirs and involve yourself? Tell them everything bit by bit as your friend does his routine, also beforehand or afterwards?) You see it's quiet rough and I wanted to share this with you guys, even though I'm not an expert at everything, I'm quiet comfortable approaching women, but due to exams, I can't test this thing. I'd also rather implement this in my own game at festivals, where I could do this as a fun game between different gigs I want to see.

tl;dr The point is you go up to a girl and explain that a guy is about to pickup her, then you let a guy demonstrate it, and you describe everything you did.

Have a great day wherever you are :)