My wife & I hosted my family's Christmas Eve get together this year. We had 16 people coming so we had to get creative with seating for the main meal. My Aunt & Uncle let us borrow their backup dining room table so we put the leaves in ours and butted to the tables together to make an oober table. The table stretched into the living room. We put a long table in the hallway for the chafing dishes and buffet service. It worked out really well.
I'm really pleased with the way the house handled the crowd. The open floor plan really made a difference. We do not have a morning room and I do not regret that decision. We have the 'normal' island which is different than the boomerang island some of you have. At one point everyone was gathered in the kitchen and it fit everyone just fine. The family room was perfect for gift giving / unwrapping and that included the giant 8-ft tree (we have 9-ft ceilings). We put the tree on the kitchen side of the family room next to the breakfast bar. We had planned on putting the appetizers on the breakfast bar, but the gifts sprawled out pretty far and made the breakfast bar less accessible. My wife called an audible and relocated the bulk of the apps to the family room coffee table. This also freed up space in the kitchen as she helped prepare dinner.
The whole event was a great success and I'm proud of our house. Maybe that sounds weird but I'm glad we did it.