I want to look into advertising my small biz in Sonoma County on Airbnb's "experiences" for area. How do I find someone to talk to?

You go to the website and pitch your idea for the experience you'd like to offer. This will get the ball rolling for you endeavor using the experiences plateform.

This is Google maps

You can apply your idea to the experience section once you register on airbnb, then the team supporting e,experiences can help you if this qualifies and necessary next steps