Garden Party /BBQ in Berlin

Hello everyone,

I've wanted to do a BBQ party with my friends, but lack a good location. I've looked on Google and ebay for some options but haven't found any good solutions / locations to rent for an evening.

I'd like to host this party for max. of 20 people and would like to just be able to "have the evening", meaning we'd arrive around 4 pm and just party BBQ for the evening, come again early morning next day around 8 am and clean everything and then return the keys.

I'd like it to be around 150 to 200 € for the rent of the eventsite, preferably in the northern part of Berlin. Has anyone here done something similar and has any recommendations?

Cheers