What should you click on the events home page to start adding a floorplan?

To begin adding a floorplan, selecting "Create a Diagram" is the right choice. This option is explicitly designed to initiate the process of diagramming a space for an event. When you click on this, it typically directs you toward either a new floorplan template or an interactive space where you can start customizing your layout.

The other options may sound relevant but do not directly launch the floorplan creation process in the same way. "Add Floorplan" could imply modifying or adding to an existing setup rather than starting fresh. "Design Layout" suggests working on a layout that might already be in progress, and "Upload Diagram" is meant for importing an existing design rather than creating a new one. Therefore, "Create a Diagram" is the precise action to begin the journey of designing a new event space layout.