Questions about 3 day passes

So I'm kind of new to comic con and was just wondering, are different people allowed to use the same 3 day pass just on different days? For example if I go on Friday, can someone else use my pass the next day?

Second question, if that is allowed, does the person who purchased the tickets have to be the one to pick them up? If the person who purchased them can't make it with us on Friday, would someone else be able to use a screenshot of his email to pick them up, or do he and his ID need to be present? (We couldn't have them mailed to us so we have to pick them up there)

I hope my questions make sense. Thank you!