Whatever cameras you are comfortable with - and perhaps a MF camera for a roll of formal shots on a pod. Pick up a bunch of disposable film cameras (do they still make them? LOL!) and spread them out on the tables at the reception with notes telling the guests to use them. That way you "work" only during the ceremony and a few shots on either side. Then put the camera down at the reception and party!
At the end, gather up the cameras and take the film to be processed.