Please watch out the official event http://www.berlinbear.de/en/events/1490/bear-summer-berlin-2016

If you would like to join us for a group transportation ticket and accomodation, you have to register until 5/20/2016.
 
Recommended accomodation:
HappyGoLucky Hotel+Hostel, 23,10€/4nights
(other options you can discuss with the organizer after registration)