ST PETERSBURG, Fla. (November 7, 2018) – Public sales for three-day tickets to the 2019 Firestone Grand Prix of St. Petersburg begin tomorrow (Thursday, November 8) at 10 a.m. ET. Tickets may be purchased for the 15th annual event online atgpstpete.com or by calling 1-877-725-8849. The three-day festival in downtown St. Petersburg opens the IndyCar Series season for the ninth…