Are you dreaming of a white Christmas?  The Katy Market Days will make your dream come true.  On Saturday, December 17, snow will arrive at noon at Avenue B in Old Town Katy.  Katy's Old Fashioned Christmas Festival will take place 10:00 am to 6:00 pm.  Along with snow, there will be food, entertainment, market vendors and even Santa.  The event is free, but visitors are asked to bring donations of canned goods for Katy Christian Ministries.