The following sources contain information on professional development opportunities for K-12 teachers of Foreign Languages:
Greater Washington Association of Teachers of Foreign Languages:
https://www.gwatfldc.org/
Alliance Française de Chicago:
https://www.af-chicago.org/professional-development-for-french-teachers
Middlebury Institute of International Studies:
https://www.middlebury.edu/institute/academics/additional-programs/professional/teacher-training