As a new login system we use the Wacken.ID. To link your current account in the Wacken Forum with the Wacken.ID, please click on the link and enter your e-mail address, which you also use in the forum. A user with your username and email address will be created automatically. You will then receive an email and will need to confirm your Wacken.ID.
Maybe you could tell the Security about that, they'll help you. And in the worst case you could ask someone of the Wacken inhabitants if you could camp in his/her garden for the 2 days. That should be no problem.