That's how you Advent Calendar sew it:
For the loops, cut 3 pieces of fabric measuring 30 x 10 cm each. Fold them together right sides to right sides and close the long edge with a straight line. Turn the tubes over and iron them
For the back of the calendar, cut a piece of fabric measuring 53 x 56 cm
Now cut the Fabric cut according to the printed instructions and iron the bags according to the instructions. Sew them on as described
Now pin the finished front side right on right with the back fabric on top of each other, inserting the loops on the top side. Close all around with a straight stitch, but leave a turning opening. Cut back the seam allowances at the corners slightly
Now the calendar is turned and ironed. Close the turning opening. The magic seam is best suited for this
Now you have the great Advent Calendar finished and can hang it as an eye-catcher in your home. Every year it will bring you and your loved ones new joy at Christmas time!