Liked the concept and the demo, but Im stuck and unable to proceed with the demo when I entered an invalid email address format in the attendee's list.

Entries in the Attendees list must be a valid email address, or I think it must be in a valid email addr format. If even by mistake you enter an invalid format, you are stuck and a 'Critical' message keeps popping up even if you click on OK.

I could proceed no further, and I had to close the window. Too bad.

Small bug.