Sports bar as venue

Need a little advice. I have tossed the idea around in my head of doing our “wedding” at a sports bar. Any have any idea how much that would cost? We already have a child and live together so it is very nontraditional. And I don’t even want to “walk down an aisle” or anything of the sore. I really just want to have a casual party then be like “hey everybody we’re gonna get married real quick”. My dad is ordained and I would be fine with doing it a random day of the week anywhere. However, my fiancé wants his mother and friends to be there. We thought about doing it at home, but our home is nowhere near ready to entertain. Its on the lake but It’s basically under construction. I figured it would be more stressful trying to get everything the ready than it’s worth. So the sports bar — no decorations, no drinks on us, no food provided by us. I just basically want to reserve the whole patio for the night. Want to keep it as cheap and casual as possible. Any ideas?