Here are some additional resources you may find helpful:

Plinth Gallery Workshops
http://plinthgallery.com/workshops/

National Council of Education for the Ceramic Arts
http://nceca.net

National Council of Education for the Ceramic Arts YouTube Station
https://www.youtube.com/user/WatchNCECA

Ceramics Daily:
http://ceramicartsdaily.org/

Juried Arts Services (calls for entry)
http://www.juriedartservices.com/index.php?content=home_new

CaFe (calls for entry)
https://www.callforentry.org

Anderson Ranch Workshops:
http://www.andersonranch.org

Arvada Ceramic Arts Guild Workshops Calendar:
http://www.arvadaceramicarts.org/Workshops.html