When it came time for class parties, I was able to make a list of food and party items (plates, napkins, supplies for a special game or activity) for parents to send in. I asked for a few volunteers to come in and help out. The VolunteerSpot system displayed all of my requests and made it simple for parents to see what was needed and to sign up.
If you haven’t tried it already, it is worth looking into. It’s free, easy, and can save you time.