The Spring Feast as found in Leviticus 23 have several parts.  We tend to call the major chunk of it Passover, which involves 8 days. Then we have a 50 day count to reach Shavu'ot, Pentecost.  The Passover week includes the Feast of Unleavened Bread, First Fruits, and the 21st of Nisan.  These are all appointed times that we are to keep. While the Spring Feasts were fulfilled by Yeshua during His first coming, we are still to participate in them as Colossians 2:17 tells us that they still point to things to come.  We gather together for a traditonal sedar meal and discuss the Exodus from Egypt and from the sin and death, via Yeshua.  We then celebrate His resurrection and begin the counting of the Omer in anticipation of Shavu'ot.  These feasts are so rich in meaning!  We count it a blessing to have learned about our inclusion in the feasts of the L-rd.  Below is a link to a thorough teaching on the Spring Feasts.  I highly recommend you take the time to explore the shadows of Messiah in each of the feasts elements.

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Spring Feasts