COUNTRY LIVING FAIR RETURNS TO NASHVILLE, TENNESSEE, APRIL 22-24   Nancy Fuller, TV Personality & Author of Farmhouse Rules, to Speak at Fair and Sign Copies of Her New Cookbook Farmhouse Rules on Saturday, April 23, at 12 p.m. and Sunday, April 24, at 1 p.m.   WHAT: The Country Living Fair brings the magazine’s content to…