Maybe it's a good idea to add the folowing:

*People can get a refund for their ticket any time as long as the XMR isn't converted to fiat, minus transaction and handling fees

*The XMR will be converted to fiat when we reach our goal (for this party 10 USD)

*The full amount will be used to organize the party

*People joining the party only need to arrange their own travel. When they arrive at the party, they don't need to pay anything (unless super expensive optional stuff :P) So the room, food, drinks etc are all included. Just have a good time and don't worry about money ;)

I think these things would incentivize others to buy their tickets :)

Where will the party be organized? Malla?