You're holding an event and want the currency that your tickets are shown in at checkout to be something other than the default USD. 

Quick Start

  1. Head to Event Setup > Settings > Billing & Tax Settings.
  2. Click on the dropdown menu under Payment Currency.

  3. Scroll to find your currency of choice, or type it in. 
  4. Once you've selected it, press Save.

The currency shown on your event site at registration should update straight away. 

Note: that you can only show tickets in one currency at a time on your event. So you can't be shown one ticket in GBP and another in USD for example.

These settings are event-level, so if you have multiple events and want them all to be in a currency different from USD, you'll have to do this for each event.