Balloonacy tells the story of a lonely old man who discovers an unlikely friendship with a red balloon that floats into his life unexpectedly through the window. Packed with physical comedy that will charm and delight young audiences, this award-winning play shows how with a little imagination and acceptance, companionship can come from the most unlikely of places. Best for ages 1 to 5. This is an Imagination Stage production at the Atlas, 1333 H St. NE, April 11 to 16. $12. atlasarts.org.