This is not a feature we currently have available within Event Espresso.
It would be possible to do with some custom development if you have a developer on your team, if not we have some that are familiar with Event Espresso here:
The support post ‘prefill fields via url’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.
Support forum for Event Espresso 3 and Event Espresso 4.