On November 21 we celebrate the Feast of the Entrance of the Theotokos into the Temple. This feast celebrates the day when the Theotokos, still a child, went to the Temple. The background story to this event is pretty important:
Joachim and Anna were devout Jews who loved God very much. They lived on only a third of their income, tithing and giving away the rest. Yet they had no child. They promised God that they would give their child back to Him, if He would grant them one, and He blessed them with the gift of their daughter Mary.