Giving back.
Host a blood drive to help save lives. This benefits your local community health organizations as well as cultivates generosity and selflessness amongst students. Local Red Cross offices are always looking for places to host blood drives.
Turn the Blood Drive into a House competition to incentivize participation. The House that gets the most people to donate gets a 1000 points! Students can even invite friends and family to participate. Now, it's a community-wide event.