Tomorrow (April 2nd) at sundown is the beginning of Passover, lasting until sundown on Tuesday, (April 3rd). After Passover (Pesach) begins the Feast of Unleavened Bread lasting seven days.
I've found a wonderful article on First Fruits of Zion regarding these two Feasts of the Lord (often referred to collectively as Passover in our modern times). Most articles on this site require membership, however you can join for free to receive emails and to access a treasure of resources. I recommend membership to anyone wanting to learn more about the Lord and Christianity's Jewish roots.
The article I found is Passover - Remembering Our Redemption. It does require membership to read the entire article, however it takes only a few moments to join and is definitely worth it! I recommend taking the time to read this in honor of this upcoming Feast.