One of my creative clients decided to name her tables instead of numbering them. She had each table designated by either a vacation spot her and her husband had visited, a hobby they have, or one of their pets. There were photos instead of table numbers. It was a real conversation starter at the table. This could be tweaked if you’re sitting groups by interest. Your work friends could have one photo, your family and his family another, your motorcycle group another, your friends from the gym another (tell the caterer not to give them any carbs!)