We've been doing this event for over 20 years and everybody loves it. On Valentine's Day all the girls get cut out red paper hearts with pins in first period. They put their name on them and pin them to their chest. During breaks and lunch (not during class time) all the boys are trying to get the girls to acknowledge them - if they talk to a boy, smile at him, or laugh at him the boy gets her heart and he pins it to his chest. At the end of the day we have an assembly and we call up the boys with the most hearts - we count them and the boy with the most hearts wins a gift certificate to a restaurant in town (we have a really good Italian one that we use). All the girls, who still have their hearts, then go up front and put one shoe into a shoe pile. The winning boy then selects one shoe and that girl also wins a gift certificate. We use to make them go to the restaurant together, but that didn't really work so they can take someone else if they want. The really fun part of this is when you do it for more than one year because the next year, the boys wear the hearts and the girls get to steal them.
E. Thomas