One of the main ways Passover is celebrated is by having two seders, which is a retelling of the Passover story using various foods as symbols. Another way of marking Passover is by not eating anything that is leavened for the eight days of Passover. Dave and I don't do this very well :)
The beet replaces the shank bone for us. This reminds us of the lamb which was sacrificed so the Israelites could mark an "X" on their doors so the Angel of Death would pass over their houses, thus saving them from the plague of the Death Of The Firstborn. A beet's juice looks like blood so that is why it is used as the alternate.
The orange on the seder plate is a reminder to keep working for justice. At one point, in the argument of whether women could be rabbis, a conservative rabbi remarked, "A woman on the bimah (the front of the synagogue) is like an orange on the seder plate. It just doesn't belong." Thus, we have an orange on our seder plate.
A unique part of our seder this year was Dave's incorporation of Lego to help tell the story.
Then God chose Moses to tell Pharoah to let the Israelites go. Dave decided that Moses' speech may have sounded something like this! It really is worth a watch :)
Thankfully, there was another miracle and the Red Sea parted...