Hey Sarah,
Thank you for reaching out to us!
As I can see from here you have Woocommerce enabled in your site to sell the tickets so to get started, I would recommend you to head over to Woocommerce > Settings and check if the “Enable Taxes” option is enabled. Also, please make sure that you don’t have the option to exclude taxes when displaying the price enabled. You’ll find more info about these settings in the following article:
WooCommerce and VAT taxes
I hope this helps! If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can!
Cheers,
Patricia