Room for rent for birthday party

I'm going to celebrate my 30th birthday this year. For this, I'm looking for a room to rent for about 50 people. It should provide something to cool drinks, as well as a sound system.

I've been looking into Jugendtreffs and similar locations like Boomerang in Moosach or Cosima Jugendtreff. But they are already booked for the planned day.

Does anyone have some tips or ideas? Preferably somewhere in the Northwest of Munich. Like Moosach, Nymphenburg, Menzing. But I would be happy about any place Munich. Would also be great if it's not more than 300€ to rent.

Thanks ❤️