"Always remember this day. For all time to come, you and your children after you must celebrate this day as a feast in honor of the Lord. It is a law that will last forever.Always Remember. The Lord doesn't forget but humans do, so the Lord created a marker for his people, the Isrealites. God instituted a feast, a celebration to take place each year, a holiday, to help them mark this event forever, to help them remember what took place in Egypt - God freed his people from slavery.
... "Celebrate the Feast of Unleavened Bread. I brought you out of Egypt on this very day like an army on the march. It is a law that will last for all time to come.
... "Your children will ask you, 'What does this holy day mean to you?' Tell them, 'It's the Passover sacrifice in honor of the Lord. He passed over the houses of the people of Israel in Egypt. He spared our homes when he struck the Egyptians down.' "
... The Lord kept watch that night to bring them out of Egypt. So on that same night every year all of the Israelites must keep watch. They must do it to honor the Lord for all time to come.(New International Reader's Version)
Below is a creative video montage of the events in Exodus so far.