Is there banquet room

I believe that the Octagonal Barn can be rented out as a banquet hall. It isn't very large and the maximum guests seated:112 and "reception style": 150. Check out their Events Packet on their website for more information. https://www.mcmenamins.com/private-events/meetings/cornelius-pass-roadhouse

There are lots of spaces to rent, inside and outside. Often catered events seem to do the octagonal barn as mentioned above, or there is a separate house with space to use (a few rooms and hallways).

No