Berlin format will be 16DE(guess btw)
11 days isn't enough to do GSL->8SE
16SE doesn't make sense
Also tournament format description is "Double Elimination"
it would be long enough for 2 DE groups with winners getting seeded to semi-finals, and wb losers and lb winners play quarter finals (opening matches could be BO1) - just like this: https://liquipedia.net/counterstrike/DreamHack/2021/Spring
Round-Robin is a garbage format that decides winners through arbitrary nitpick-y tiebreakers if a group is too competitive. Because of disparities between skill levels in teams as well, it's possible that a team could be so far ahead to already qualify but still be required to play matches, resulting in garbage time that extends through an entire series. There are too many matches, there's no way to create a storyline in a round-robin, and it's an unfun boring format.
https://www.hltv.org/news/29601/the-unacceptable-flaws-of-the-round-robin-format
Also, the EPL playoffs bracket format is atroooocious.