Just like other important "3"s in Scripture (the Godhead/Trinity, the mountains of Moriah, Sinai & Zion, the 3 compartments of the Sanctuary, the 3 Advents of what we call "Christmas", the 2nd Coming & the return after the millennium, etc.) there the 3 important feasts.
1) Feast of Passover (Pre-Cross) - It is the Passover of the Lord. This day will be a day of remembering for you. You will observe it as a festival to the Lord.
2) Communion Service (Post-Cross) - And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
3) Marriage Supper - (Post-2nd Advent) - Blessed are they which are called unto the marriage supper of the Lamb.
1) Feast of Passover (Pre-Cross) - It is the Passover of the Lord. This day will be a day of remembering for you. You will observe it as a festival to the Lord.
Exodus 12:11,14
2) Communion Service (Post-Cross) - And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
1 Corinthians 11:24,25
3) Marriage Supper - (Post-2nd Advent) - Blessed are they which are called unto the marriage supper of the Lamb.
Revelation 19:9