If you wish to upgrade a delegate pass, you can do so from the Purchased Passes section of your Pass Manager. You would need to go to the pass, click on Pass Options and then choose to Change Pass.
You would then see the pass under the Pending Orders section and to complete the upgrade, you would need to proceed to Checkout. Please note you will be required to pay the difference in cost for the upgrade.
If you decide to upgrade a delegate pass, you will only have to pay for the difference in price between the two passes.
You can upgrade a delegate pass online or upon arrival at the Festival, up until 28 September 2018.