Any school, organization, non-profit, company, etc. that is interested in participating in an event supporting education is eligible to exhibit.
This could be a four-year university, a community college or vocational school, any organization looking to hire students directly out of high school or from a specific college or graduate program. An exhibitor could come from various backgrounds within the Expo!
Additionally, student-centered groups (i.e. student-led, highlighting student work, etc.) are a great fit for the Expo.