Sorry I didn't notice this earlier. Their are two elf hearing from medieval fair 2011 but only one is listed under Costumes-Other Costume Parts. This one is there: But this one isn't,
the Pink Cupcake Balloon (Candy Event '15) can be found in Objects > Food, but not in Party Supplies the Purple Cupcake Balloon is exactly the opposite, it's in Party Supplies but not in Food