We cannot advise you on which documents you will need, as this depends on your nationality and the country you live in.
Travelling to your destination
The VisaHQ website can tell you exactly what you need. Remember to include the countries you might travel through to reach your final destination as well.
At the marina and check-in
You will need to bring your passport or/and ID* to the event for check-in.
* If you are travelling through the Schengen area and are using your ID card, this is fine as long as you have entered your passport details into your booking profile before departure.