Are you sure you need this registration? If you only want to partecipate to an event, you don't need a JUG Events account. Simply go to the event page and click on the "register yourself" button (if the organizer activated this feature for the event you are interested to partecipate). Just a valid e-mail will be requested.
You need this registration only if you are a JUG representative and you want to organize and publish some events for your JUG.