Even lacking a single wing-flapping or four-legged creature in attendance, an outdoor (extended) family meal (where the invitation sent by a sister of the Yard Man pretty much said "Everybody come! Bring some food!") was easier to tidy up for the fact of being served atop grass and under sky* (Though, er, it's true I didn't stick around to verify this fact, tsk, tsk.)
Of course, for simply standing up and walking away from dirty dishes, food scraps and spills, crumbs on the floor and crumpled napkins, nothing beats walking into a pizza shop and arranging the family around a table with ten chairs, two booster seats and a high chair.
(And that about cleans up this tale of clean-up)