Here's an excellent reminder that comes in the form of a tip from David Douglas High School (Portland):
If you've got an existing and upcoming activity in which all of your seniors will participate, use it to promote your CAW event. This year, DDHS is holding their schoolwide PSAT a couple of weeks before CAW. While the 9th-11th graders are in testing, the seniors will be gathered for an event when other senior-only activities (i.e. Josten's will be there) are taking place. They'll be talking up CAW and making sure students know what they need to do to prepare.