By Eva Marie UZCATEGUI / AFP Art Basel is thinking big for the 20th edition of Miami Beach, which will be held December 1-3 in the American city. In its main section, it will bring together 213 galleries — the highest number of exhibitors in the fair’s history. Art Basel is thinking big for the 20th edition of Miami Beach, which will be held December 1-3 in the American city. In its main section, it will bring together 213 galleries — the highest number of exhibitors in the fair’s history. On the schedule are event regulars such as Gagosian, Zwirner, Hauser & Wirth, Pace, Lisson Gallery, Tha…