Dry Run - Ending (Unwanted) Interactions

Note: there is a $5 - 10 suggested donation to help cover venue rental. You're done talking, but they aren't taking the hint. How do you exit an interaction when polite and even clear communication has failed? Detailed event description coming soon. This is a "dry run" event. It's one of the first times we're hosting it. Expect some things to be bumpy or unrefined until we figure out the best format for this event. Feedback and suggestions are very welcome.