It would be interesting to see if the court would hold the event organizers responsible for withholding this information as a part of event promotion. Sure, gun law is gun law, but consumer protection regulations are an entirely different thing.
As a team, Takeover purchased a service that did not have sufficient information of the possible legal consequences related to the attendance to the event. The information about the gun laws in germany can be aquired from all kinds of european law websites and services. However, it does not change the fact that when Takeover agreed to participate to this event, sufficient information was not provided by the event organizers.
If i was to invite someone to Finland to smoke some weed, i would be held liable as an accomplice. As Takeover was invited to take part in illegal activity without informing them of it, that would make the organizers at least partially liable. This, according to my reasoning, would be the case in both consumer- and criminal prosecution. Hopefully Takeover considers looking further into this option.
BR,
Jarmo Nieminen
Finland