Save and Run the Workflow
From Automator's File menu, select "Save As Plugin..." and a sheet will be attached to the workflow window.
Save the workflow as a plug-in for the Script Menu, and name it Welcome to the Party!
Once you're ready to start taking snapshots, select the workflow from the Script Menu at the top right of the screen, and the workflow will begin by presenting the dialog for entering the name of the person whose picture is being taken:
After you've entered a name, the workflow will continue and take a snapshot:
Once the snapshot has been taken, the screen saver will be activated to display all of the photos taken so far. Note that each photo displays the name you entered in the dialog!
When you're ready to a take another photo, just move the mouse and the screen saver will vanish, revealing the waiting workflow dialog for the next photo.