Autofill your registrations

Add everyone you're registering, copy the bookmarklet, and save it to your bookmarks bar. One click on the ticket page fills in every registration ID and postcode.

javascript:(function()%7Bconst%20data%3D%5B%5D%3Bfunction%20autoFillElements()%7Bdata.forEach((item%2Cindex)%3D%3E%7Bconst%20registrationIdElement%3Ddocument.getElementById(%60registrations_%24%7Bindex%7D__RegistrationId%60)%3Bconst%20postcodeElement%3Ddocument.getElementById(%60registrations_%24%7Bindex%7D__PostCode%60)%3Bif(registrationIdElement)%7BregistrationIdElement.value%3Ditem.registrationId%3B%7Dif(postcodeElement)%7BpostcodeElement.value%3Ditem.postcode%3B%7D%7D)%3B%7Dfunction%20clickButtonById(buttonId)%7Bconst%20button%3Ddocument.getElementById(buttonId)%3Bif(button)%7BsetTimeout(function()%20%7B%20button.click()%3B%20%7D%2C%2020)%3B%7D%7DautoFillElements()%3BclickButtonById('add_registrations')%3B%7D)()%3B

Adding it to your bookmarks bar

Copy the bookmarklet with the button below.
Show your bookmarks bar. On a Mac press ⌘⇧B; on Windows or Linux press Ctrl+Shift+B. In Safari, go to View → Show Bookmarks Bar instead.
Right-click the bookmarks bar and choose “Add page…”. Name it “Add registrations”, then paste the bookmarklet over the URL and save.
On the ticket page, click the bookmark. Every ID and postcode fills itself in.

Not sure it works? Try it on a fake form.