Is there a semi-private area to host a small dinner group with a presentation?

Yes there are two

There is a semi enclosed patio on the east side! Best to call Grass Roots.

It is an open floor plan and i dont think there are any private rooms in the back. I could be mistaken but i have been there 5 times at least and never saw a private room

I don't think there is a separate area for private dinning.