Luckily I managed to buy them, but many of my friends failed to. I hope they move it to another, bigger place due to big demand, there seems to be plenty of people interested in seeing them, even despite the fact that there are 4 other gigs in Germany in those days.

is there any chance for you to get tickets ? Maybe re-sale?

At this point, he can try to get something closer to the time of the gig on some fan groups (there's always some who can't attend), or hope for the concert to be relocated.