Hi Bonnie!
If you are logged into an Eventeny account and sunmit an application for an event, that application will always be tied to your account, and the information you have listed in your account. The best way for an Event organizer to apply on behalf of someone else is to use the "Add Submission" option that is available in your list of submitted applications. I would recommend withdrawing the current application and resubmit it using the add submission option, so it is not tied to your account, and instead gets tied to the vendor's account.