The beverage jars could be presented like this out of the back patio with the guest's names written on one side of the tags and the table names written on the other side. That way, they serve as escort cards to guide the guests to their table inside.
At each place, there would be one of these filled with ???, topped with burlap cloth, tied with jute string and tagged with a small round green tag that says "thank you" on one side and has the guest's name on the other.