You can take a sketch paper first, draw a few flowers on the side, leave a third in the middle to draw a bowl of porridge, write nine knots on it, and write the origin of nine knots on the left and right.

Example diagram:

Introduction to Aojiu Festival: Aojiu Festival is a Han folk festival in Shijie, Fuzhou City, Fujian Province, which falls on the 29th day of the first lunar month. On this day, every household will cook nine porridge to worship their ancestors or give it to relatives and friends; Married women should also send Jiu Zhou back to their parents' home to honor their parents.