A fair concept, you know the good things so let me be critical
- The nudge feature may fall out favor in group, I hope you have more arrows in your quiver
- You create a peer pressure eco-system, also look if you can introduce a peer incentivi-zation feature like a badge etc.,
- Will look for a feature where the organizer sets up a pre-event event and a deadline before which money needs to come in
- Also put in a word or two about the transaction security you provide to get some confidence from those early birds
My two cents...
