Food Network is setting its holiday table with more than 50 hours of season programming, including a Christmas-themed spinoff of Guy Fieri’s “Tournament of Champions,” the second season of “Harry Potter: Wizards of Baking,” and a new sweets competition hosted by Wells Adams. Other yuletide content will include fresh seasons of Food Network staples “Beat Bobby Flay: Holiday Throwdown” and “Holiday Baking Championship,” as well as Chip and Joanna Gaines’ new gingerbread-house-making competition