The rules are unwritten, gentle, and shorter than people expect.
Trading is the part that turns a pile of bracelets into a night you remember. Nobody hands you a rulebook at the door, so here is what everyone else already worked out.
Someone catches your eye, you hold up a wrist, they nod. You do the handshake, and a bracelet moves. It takes thirty seconds and you will both be grinning by the end.
Bring more than you think. Ten to fifteen singles is a comfortable first stack — enough to trade freely all night without running down to the pieces you actually care about. Keep the ones you are not trading on the other wrist, or in a bag.
Make a few with words on them. Word bracelets trade faster than anything else, because someone reads it, laughs, and wants that exact one.
Trade with someone who is also standing alone. It is easier, it is kinder, and it is how most people got their first piece. Beginners are not a problem in this scene, they are the point of it.