9/18 This popular trio of Seattle elementary schoolteachers write and perform wacky, Beatles-influenced sing-along songs about subjects such as moon boots and a “Ukulalien” (a ukulele-playing alien, of course). But the best part about these 6-year-olds-at-heart is that their music is good enough that parents actually enjoy it too. Join in for foot-stomping, hand-clapping, chicken-dancing romps…