MOSI will roll out its Festival of Chocolate to revive your dreams of being a kid in a candy store. Indulge in goodies from confectioners and bakeries, or attend demos that range from the practical to the utterly impressive — the towering cake designs are beyond comprehension. On Saturday, a Cocoa Couture Fashion Show will have you wondering, “How did they make that?” Plus, wine and chocolate pairings and good old-fashioned eating competitions will be featured too. Local vendors include Joey Biscotti, the handmade Brazilian treats of Tres Suspiros, The Sweet Spot and more. New this year: The Great American Candy Run, a sweet and tasty obstacle course, on Mon., Jan. 20, that starts at 10 a.m., and continues throughout the day. Space is limited, so it’s best to register in advance.