Our music teacher organizations and the Calgary Arts Summer School Association do a wonderful job at offering professional development opportunities for music teachers through workshops and conferences.
One thing I would like to get into more is to go away to study music teaching and performance. Here are some summer music programs for music teachers that caught my eye:
Adult Continuing Education Courses in Music at the Victoria Conservatory of Music
Boston University Summer Music Courses
Summer Workshops for Musicians and Music Teachers at MSU
Summer 2013 Workshops for Music Teachers at the University of Wisconsin
University of Delaware Workshops for Music Educators
University of Massachusetts Amherst Music and Drama Workshops and Courses
Video Conferencing and "Live" Music Technology and Jazz Education Workshops at Western State College