I've been part of Johnson School's multicultural day the past few years. Each year I put on some authentic German clothing (at least older German -Austrian -- like in The Sound of Music), sing some German songs, teach some German phrases and answer a few questions about Germany for the students. Over the course of several years, students spend time learning about many countries (each year they visit 4 during multicultural day.) As usual, it was a blast.
I think the folks dug the costume, too.