Apple Wallet lets you keep your payment cards, and tickets, boarding passes, etc in one place.
You can add your ticket to Apple Wallet from the Skiddle app. Once added, on the day of the event your ticket will appear on your iPhone lock screen when you get close to the event venue. This makes it easy for you to swipe and access your ticket without having to open the app.
More info on Apple Wallet can be found here: https://support.apple.com/en-gb/HT204003