Colossians 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: 17 Which are a shadow of things to come; but the body is of Christ.
Heaven is timeless, unchanging, eternity. There is no "today is friday, tomorrow is the Sabbath." There is no "it's Yom Kippur in 6 months it will be Passover."
Rather all of the days and holidays and feasts all are a shadow of the real thing, the ultimate experience of existence with God. And that experience is, forever and always, the Father begetting the Son, who offers Himself to the Father, through the Spirit. We will be guests at this great outpouring of mutual love and this feast will outshadow anythign we have experienced.
SD