Hallel (ISCO) is a union of conductors and choirs in Israel. ICO was founded in June 1998 in order “to support and advance choral singing in Israel.” It promotes workshops, seminars, gatherings, pedagogy, activities, including international activities, publishes a quarterly bulletin and supports a website. The website is very out of date in terms of concert listings, but is maintained in Hebrew and English. Nevertheless contact information in provided.
http://www.geocities.com/Vienna/Studio/5379/