2023 Harry Potter Square Calendar. Each month in this wall calendar features a character from the popular film series such as Harry Potter, Ron Weasley, and Hermione Granger to name a few. This official calendar has plenty of room for all your important 2023 dates in the large monthly date panels provided. Product Dimensions: 305 X 305 MM Official Harry Potter Product Danilo is the leading publisher of officially licensed calendars, diaries, greeting cards, gift wrap and gift bags in the UK. We are a family run company that’s been operating for more than 40 years. Our licenses range from baby to adult. All the paper we use is responsibly sourced and we only work with suppliers and manufacturers that meet our stringent ethical requirements.