Sonoma County Tourism https://www.sonomacounty.com/
These super nice folks know what they are doing (and everything there is to know about Sonoma County). They can help you find the perfect lodging, venue, supplier… and just tell you the truth about what they think will work for your group and what won’t. Call them first.
Like I said… We had 36 hours and Sonoma County is big, really big, and offers a zillion more things than I just told you about. I will put this in our web site’s Library and keep adding things to it as we go. It’s my job. :)