And There you go ! The jar is ready! Now you can organize the Sorting Hat ceremony so that each participant, each in turn, puts their hand in the jar and draws the name of their house (Slytherin or Gryffindor).
Reminder: you can also prepare slips of paper with the names of the other two houses, Hufflepuff and Ravenclaw. You never know, some little wizards might have a better place there! But, between us, we all know that everyone wants to belong to the Slytherin camp or to the Gryffindor camp.