When Shabbat comes to an end on Saturday evening, a Havdalah ceremony is held to mark the occasion. A blessing is said over wine, a symbol of joy, then over sweet spices, to comfort the soul at the loss of Shabbat. Finally a multi-wicked candle is lit to show that Shabbat has ended and that fire may be created again.
Children could discuss their weekly routines and talk about times of the week that are special to them. They could then compare this to the Shabbat and the Havdalah ceremony.