Professional and trade associations can be good sources of information about industry and employment trends. To identify associations related to an industry you're exploring, consult Encyclopedia of Associations, shelved at Reference Desk AS8 .E5.
Listed below are associations related to continuing education.
American Association for Adult and Continuing Education
Association for Continuing Higher Education
National Association for Continuing Education
University Professional and Continuing Education Association
Publishes a book called "Lifelong Learning Trends."