Beverage should be considered carefully. Lower temperature by about 5 degrees to accommodate additional people. Also, staff should not use the time to catch up on personal or business conversations - all attention should be devoted to introducing clients to staff members and answering their questions about the purpose for the party. Have this display in the front foyer where they can see it when they arrive and pick up copies when they leave. Debrief with staff for 10 minutes afterward to jot down conversations, questions and ideas.
Video clips can add an interesting dimension also.
Be sure to send copies to the NAPS office as soon as possible.