Need advice for adding users from a database but also "one-time registrations"

[Eiolon]

I have an application for event registration.  Users log into their account at a website so they can register for an event.  It also keeps track of events they previously attended and other records.

 

Now, I want to make it so I can register people for the event but without needing to create a user account.  Call it a "one-time registration".  The users would not be able to log into the website to check for reminders, etc.

 

Any suggestions on how I can design the app for one-time registration?