Tickets are sold only via Eventix (below) and via GmTicket (here).
With Eventix we work with ‘sealed tickets’, which means your ticket file is not visible right after the purchase. For safety reasons it will be visible only a day before the event. If you cannot make it to the event you can safely resell your tickets via our partner TicketSwap.

More info about sealed tickets can be found on the Info page Tickets FAQ-Sealed Tickets section.