(Note that Jane Milliman of "Upstate Gardeners' Journal" provides a very thorough listing of local 'green' events. Check it out. UGJ Calendar: http://www.upstategardenersjournal.com/pages/Calendar.html

Also, the Landmark Society of Western NY has events that may be of interest. Landmark Society's Events: http://www.landmarksociety.org/events/events.html

On a more professional level, here's events listed by the NYS Arborists Association. NYS Arborists Calendar: http://www.newyorkstatearborists.com/calendar.htm