September 8-11                  Jefferson County Fair Park, Jefferson, WI   
                                           Wisconsin Sheep & Wool Festival

September 9-10                  Scotts Bluff County Fairgrounds, Event Center, Mitchell, NE 
                                            Scotts Bluff Valley Fiber Arts Fair

September 29-October 4    Harveyville Project, Harveyville, KS
                                            Fall Yarn School

October 8-9                        SE Minnesota & Western WI
                                           Sheep and Fiber Farm Tour

October  22                         Kirkwood Center, Marion, IA  
                                            Shepherds Market Fall Fiber Festival

November 4-6                     Minneapolis, MN
                                            Vogue Knitting Live!

November 5                        Eisenhower Community Center, Hopkins, MN
                                            Fall Fiber Festival

Traveling further afield? Here are some ways to find other events.

Ravelry: Click the search icon then select events.

Knitter's Review has a calendar of yarn related events world wide on their website