At your wedding reception, you will want to have a formal introduction done by your master of ceremonies, DJ or your band leader. They should introduce everyone as they enter the room that is in the wedding party. This way, everyone knows who is who!
A wedding reception can have a variety of different activities, but generally will include a meal, introductions as well as dancing. If you plan to do other things or stray from this area, consider what your guests will feel about this and how well it allows them to fit in.