But but, it is better to have a budget first I mean, try to agree on an INITIAL baseline price and see how many people would attend. Then you can start planning, proposing budget change/increase etc...
I like the idea of the entry fee being one penny. Paid at the door, bitcoin only accepted of course. It feels so delightfully Galt-ish, like when Dagney was told the repairs to her plane would be a few cents, payable only in gold.