If got the wrong size shirt can i take back and exchange

Of course

Lol noooo

It all depends on what vendor

Typically not, but it really depends on the vendor. Many of them aren't even there regularly so it would be hard to know.

No

I have successfully gone to the booth and said I just wanted to buy one thing because I was there the other day and didn't want to stay and they let me in without paying. but as far as the exchange goes I guess that depends on the vendor.

I don't think you can once you leav