Well.....if you set up rows of tables only 3 feet a[art, you will have people wedged in like sardines, and it will take a master plan to get everyone seated.....
Couldn't you seat some of the more able bodied on a deck? Or set up a couple of tables in the living room or even a bedroom?
I know you want to all be together....but I am getting claustrophobic just thinking about such close quarters!
Linda C

You are SO correct Linda. After writing that question last night I had my husband help me (6'5 1/2" with none bending knees :) and I sat up two tables with chairs back to back. We decided 52" in the minumin space for two chairs back to back AND people to walk past the seated people.

I have had to eliminate a total row of tables but have come up with some ideas for added seating by taking our piano out of the room, turning the tables the other way and using 4 foot tables in otherwised unusable spaces. I can't seat 50 but am up to 45 people leaving very comfortable spaces for movement.

You are right - we really hate to isolate people in other rooms as the rooms are very spread out and the closest room (living room) will be used after the meal for the family sharing circle and BINGO. It has carpet and brand new uphostered furniture so you hate to put tables up in there but that is what we will do if the 50 or more arrive. THANK YOU FOR YOUR RESPONSE