By Denny Dyroff, Entertainment Editor, The Times Matt Cappy A great way to combat a chilly evening is hot jazz – a live performance of hot jazz. This weekend, the temperature may dip into the twenties outside, but an antidote can be found inside a venue in Kennett Square on Friday night. On February 25, Kennett Flash (102 Sycamore Alley, Kennett Square, 484-732-8295, http://www.kennettflash.org)...