A valid passport will be required for entry into the organizing country.
Since EuMW events are held in the European Union, no visa is usually required for travellers with passports from a number of countries, like for instance: European Union, United States, Canada, Japan, South Korea, Australia or Singapore.
However you will need to check with your local emabassy. If you need a visa we recommend that you speak with the Embassy of the organizing country in your own country at least 3 to 4 months prior to the EuMW.