By Denny Dyroff, Staff Writer, The Times  Something special happens in Kennett Square this time of the year — a popular annual event known as the Kennett Winterfest. Usually, tickets are already sold out by this time but this year some tickets remain. The Sixth Annual Kennett Winterfest (http://kennettwinterfest.com/) will be held on February 24 from 12:30-4 p.m. in a tented area near 600...