[video]
Well, there's the food, and we exchange gifts, and there are games...
The most important part is the lesson of the miracle behind it. See, the people had reclaimed their temple in a battle, and they only had enough oil to light one lamp for one day. But, a miracle enabled them to keep it lit for eight days instead. There's a lot more to it, but that's the basic story.
Part of the celebration is a retelling of the whole thing, so you'd learn about the history if you were able to come.