As a co-located event to the Web Conference, registration for W4A will be handled through the Web Conference website. The registration details are now available here.
Please note that the attendees of the Web Conference need to pay different registration fees depending on whether they are authors or just a participant. However, the authors of accepted papers for the W4A conference do not need to pay the author fee because the W4A proceedings are produced separately. If you wish to attend only W4A, you should choose the two-day ticket for 100 euro, or a student ticket for 60 euro if you are eligible. Remember that at least one author is required to register and present at the W4A conference.