You can’t just organize events like that in Berlin. There are already many other (broadly) similar events in Berlin, with more focus and better organization.
It just doesn’t seem very attractive to me and it’s a total culture clash. Paranoid security theater? No alcohol? I’m sorry, but not in Berlin.
It seems given that scenario tagging laptops and checking them on entry/exit is probably the most effective solution.
Treating all you attendees like potential thieves is simply a bad premise for a hacker event.
But even the CCC had several years of congress with this kind of "security". So I am not mad at the organizers. We even had one congress where every participant had his/her photo taken. This actually had a major uproar and wasn't done ever again. I think maybe the organizers will learn and do things differently next time. At least I hope if they do this again in Berlin.
The most ridiculous things like not bringing lighters or no smoking outside the Hanger was removed from the Term & Conditions.