Full info here http://www.marcialonga.it/dettaglio_en.php?uuid=89990BB420584BC28145A9E1B2348374
“WEDNESDAY JUNE 5th at 9.00 registrations to Marcialonga 2014 will open.
Registrations will be possible ONLY on-line and payments via credit card on http://www.marcialonga.it –> entry –> entry on-line –> sign up
Entry will be valid only if the transaction via credit card is AUTHORIZED. Registrations will be available on the new entry system EVENTBUILDER. It is necessary to login entering a e-mail address. If you are not registered before, a password will be sent to your email address. If the e-mail address is new for us it necessary to create a new account, following the instruction.”
Looks like you have to create at Eventbuilder first. We recommend you do that before 9AM that day.
Update: it looks like the registration was open in 70 minutes that day before it was fully booked.