How do I set up an event before I invite the couple?

The event page walks you through four steps: create the event, add a floor plan, add tables, invite your client. It highlights the next one until all four are done, and then shows the seating readiness instead: who is seated, who is not, who has no meal.

Most planners set the room from a venue template, place the tables, and only then invite the couple, so the couple opens a finished room and starts seating.