Here are two on the East side of NY:
Jul 28 - 29, 2012
2012 Wheels and Iron Show - Tractor Pull- Transfer and Stoneboat Pulls, Tractor Games,Parades,Vendors,Thresher Demonstrations,Kid Zone,and Pedal Pull. All colors tractors welcome- Featured tractor this year is Cockshutt , Greenwich, Washington County Fair Grounds, Greenwich N.Y (north of Albany)
http://www.ytmag.com/cgi-bin/showgd.cgi
Neversink Rondout Antique Machinery Association
Sullivan County Show:
http://www.neversinkantiquetractor.com/
Webpage isnt yet updated for 2012..but presumably they will have a September 2012 show. (they had one in 2010 and 2011)
Scot