Chirrpy's service allows you to show up to the event with just your SmartPhone with the e-ticket and QR Code. You also have the ability to print your ticket by printing the email that your ticket arrived in or clicking on the QR code image and just printing the code.
--QR code as an attachment--
Please make sure to have valid ID when presenting your ticket; the Event Organizer may require it.
If you need any additional assistance, check out the attached video!