On a business trip to Italy and I arranged to spend one day in Florence, Sunday, September 3, and wanted to reserve tickets, but none of the big museums - nor Uffizi, nor Accademia, nor Palazzo Vecchio, none - has thickets available specifically for that date, although according to their general schedule, it's a regular day (not off). Could not get tickets on the museums' websites, nor even through the tour websites, like Viator or Tripadvice. Is there a holiday day in Florence?