There are a couple of major green schoolyard conferences scheduled that people might want to check out:
1) Engaging Our Grounds Conference: September 16–18, 2011, Berkeley & San Francisco, California
Engaging Our Grounds will bring together leading green schoolyards practitioners from the United States and other countries to share the latest trends and innovations, case studies, best practices, and creative thinking in green schoolyard design, maintenance, curricula, advocacy, and funding partnerships. The conference will include a resource and networking fair, keynote presentations by visionary leaders of the school ground movement from Canada, England, Germany, Japan, and Sweden; tours of outstanding local school grounds; and networking time.
http://greenschoolyards.org/home/about_the_conference
2) Green Schools National Conference – February 27 – 29, 2012, Denver, Colorado
This conference is still in the planning stages but visit the website as more information is posted.
http://www.greenschoolsnationalconference.org/index.php