There will be no market stalls selling their wares, there will be no $15 wraps and $20 burgers, there will be no ridiculously priced bar, there will be no trinkets to take home as souvenirs. So for the most part, you will not need currency. Come as you are and you will be taken care of.
Meals will be provided, and all of your needs will be met. There will be a Kombucha Bar and a Tea House that will take regular coinage, so bring a little. If we manage to find a patron before the event who wishes to cover that expense, then that too will be provided for you for free. So get the word out and see who we can find.