The section has companies which will come to your school at lunch or after school for an extended period (once a week for a whole term) as well as educational programming which is appropriate for a one time special event or seminar. Some companies do larger scale shows which are great for fairs, end of year parties, fundraisers or other special days.
When planning school field trips, don't forget that many companies only list in one category so be sure to check the Attractions/Family Outings, Amusement Centres, Festivals, Fairs & Carnivals, and Fun for Free sections for other ideas.