Sept 5-7: Wisconsin Sheep & Wool Festival, Jefferson County Fair Park, Jefferson, WI
Sept 27-28: National Alpaca Farm Days, C&M Acres
Oct 2-7: Fall Yarn School, Harveyville Project, Harveyville, KS
Oct 9-12: Stitches East, Hartford, CT
Oct 18-19: New York Sheep and Wool Festival, Dutchess County Fairgrounds, Rhinebeck, NY
Oct 24-26: Heartland Fiber Retreat, Hotel Pattee in Perry, Iowa.
Oct 24-26: Vogue Knitting LIVE! Chicago, IL
Nov 1-2: KnitXMidwest, Walnut Woods, Des Moines, IA
Nov 16: Shepherd's Market Fiber and Fabric Festival, Amana Woolen Mill, Amana Ia.
Feb 19-22, 2015: Stitches West, Santa Clara, CA
Another good site is:
Knitter's Review has a calendar of yarn related events world wide on their website http://www.knittersreview.com/upcoming_events.asp