The Extra Early Bird Registration Fee is 400 EUR from 16th May 2011 until 31st July 2011.
The Early Bird Registration Fee is 420 EUR from 1st August 2011 until 26th September 2011.
On the first day of the conference the price on-the-spot will be 480 EUR.
The registration is complete when the registration form and the payment was sent. And you will receive a confirmation.
If you haven't paid the registration fee only completed the form, the registration is not complete. And later you cannot refer to an earlier price.