How do I create a ceremony seating chart with rows of chairs?

Add a floor plan to the event and choose Ceremony instead of Reception. Its seating unit is a row of chairs facing the front rather than a table: place the rows, set how many chairs each holds, and seat guests on them the way you would at a table.

Rows have no meals and no table body, and they do not count against a table cap. Guests seated in a row still appear in the guest list with their row and chair.