At this time, since EventNut is still so new, event tickets can only be created in USD and payments can only be accepted in USD.
We will be adding support for non-USD payments very soon (i.e. you'll be able to pay for a US-based event with a non-US credit card in the near future).
We also plan on rolling out support for non-US paid events early next year. We will likely add support for CAD first, followed by European currencies, and then additional foreign currencies based on customer feedback.