we go once around for friendship just so we can sing the sweetheart song basically, then the next one is lavaliered, (we don't do one for pinned, no one pins on our campus), and then one more for engagement. We sing the sweetheart song the whole time and the one who was lavaliered/pinned/engaged is the one who blows it out. then we stay in the circle and the sister explains how it happened.
hope this helps
PPL & mine.