I'm not intending to pass it over, and I'll get to it's significance. But first I'm trying to establish something. It's not called a "feast" in the bible. It's not called "holy", there is no commanded gathering and it's not considered a sabbath within scripture. It's a ceremony that falls withing another feast period. Do you concur?
It is the third of the seven Jewish feasts with a specific day of celebration that just so happened to occur on the day of the Resurrection. The fact that it occurs during the feast of unleavened bread makes it more important not less.