Most people know how to behave in public and maybe even in private. You don't yell, "Fire" in a movie theatre or public place if there is No Fire. You don't pretend to have a gun in school or say you do even is someone dared you to or it's Prank Day. That will get you arrested nowadays. Things that used to be done for fun or to help people such as asking who people are and where they are from in a group setting among new people may be taboo.
You have to check with the folks in charge of say a church, library, school group or other kind of club or organizer.
