Following the passage of a cold front this evening, VFR weather is forecast for most of the day tomorrow during the AOPA Fly-In and Open House. The Fly-In will be held come rain or shine. More than 25 hours of aviation seminars are scheduled inside the AOPA headquarters building and other covered locations. And inside the giant exhibition tent, more than 100 exhibitors will be displaying the latest in avionics and products for pilots. Plenty of free parking is available for those choosing to drive to the Frederick Municipal Airport, with free shuttle buses operating between the parking lots and the airport.