In the episode where Lucy, Fred and Ethel do the quick-changes to fill up the restaurant and then
leave when they find out that Ricky Ricardo is no longer playing the at the Tropicana, they make a reservation for 12, but when they are seated, the table is only set up for four people.
If you go and reserve seats for 12 at a restaurant, sometimes they will not move the tables together. Trust me, I know. We have 23 people in our family when we go out to eat, and it happens to us often.