After you have purchased your tickets you can store them in your Wallet on iOS devices. First, open the Order Confirmation Email. Under the heading, "Send tickets to someone else or view your receipt Go Here", click the Go Here link. This will take you to the order confirmation page on your mobile browser.
Next, click the View Ticket button.
Then, tap Send to iPhone (Wallet)
Here's what your ticket will look like in your Wallet:
Repeat the steps for all the tickets you want to store in your Wallet.
When you get to the event, simply open your Wallet app and show your tickets for admittance!
Looking for a refund? You'll need to contact the event organizer.