Looking for a Workshop's Location/Venue (Stuttgart)

Dear Expats!
I am helping to organise a Workshop for September in Stuttgart. The Workshop's main topic is SELF-CONFIDENCE and it is focused on women which are about to start or already running a business. For this to happen, I first must find a location/venue, where the workshop can take place. The idea is to have between 20 and 50 people.
Does anybody know a location/room/venue where this could take place and it is preferably available for free or low cost? I don't know if there are some companies or institutions supporting such initiatives and have some rooms available for the workshop.
Whatever you know, please send me a message and let's talk about.
Thank you very much in advance!
Warm regards,
Ale