OPA, the Organization for Professional Astrology is holding their 5th annual retreat on Sanibel Island, FL, September 27-30, 2007

From their website:

“The Organization for Professional Astrology (OPA) is a non-profit organization that advances the cause of professional astrology by helping astrologers get the information, tools, and experiences they need to improve their practices. It assists astrologers to improve both personally and professionally and defines and maintains professional standards for the responsible use of astrology.

OPA is dedicated to establishing astrology as an eminent spiritual, psychological and holistic tool of understanding. Our mission is to provide good astrology that expands the perspective of individuals and raises the consciousness of the planet.

Check it out!
The OPA website
Information on the 2007 retreat