The covered area of our patio is great for groups that size during the summer. We can accommodate groups of that size anytime of the year but we don't have a completely separate/private area for the group to gather. Give Meganne or Cooper a call if you would like further info (503-682-9673). If you are def looking for a place with separate banquet rooms I believe the Holiday Inn in North Wilsonville has a pretty good set up for that. Good luck!
Best spot for groups is Nicili's in Lake Oswego. Private rooms banquet and menu food and drink options. Just off I-5 at Bridgeport.
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