Several workshops have recently been posted under the Upcoming Events page for 2014.
In addition, The Eagle Hill Institute is offering 3 week-long courses that may be of interest:
Wetland Identification and Delineation, and Associated Ecology
June 15 to 21. Taught by Matt Schweisberg and Joe Homer
(Tuition = $575)
Sedges and Rushes: Identification and Ecology
June 15 to 21. Taught by Anton Reznicek
A Survey of Grasses of Northeastern North America
August 3 to 9. Taught by Dennis Magee
For general information about The Eagle Hill program, go to
http://www.eaglehill.us/programs/nhs/natural-history-seminars.shtml