With the entertaining season in full swing, I keep finding myself making a mad dash around the house, scooping up stray chairs from their regular surroundings to stand in as extra dining room seating for guests. What I could use is more accommodating furniture, like the versatile banquette. On a regular day it can seat one or two, but can just as easily hold many more when necessary—just try doing the same with a dining chair. Here are some ideas. . .