In children's theaters, colorful figures from America's past
Plucky pioneers, medicine-show hucksters, a Union Army balloonist and other colorful figures from America's past are bustling through two local children's productions. Over in Glen Echo, Adventure Theatre MTC is presenting "A Little House Christmas," a pint-sized entertainment based on the beloved books by Laura Ingalls Wilder. Meanwhile, the Kennedy Center's Family Theater houses the world premiere of "The Mostly Tr…