Revelation 19:9

9  And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.

This verse says blessed or happy are those who are called to the marriage supper of the Lamb this also could be called the marriage feast of Jesus.  This is not the marriage; the marriage has already taken place in heaven before the Father in heaven ( prior to Revelation 19:7).  The marriage feast is on earth and has invited guests.  These guests will be those who fled to the mountains at Petra and were protected by God. It will also include all those who lived through the great tribulation who did not take the mark of the Beast and  who did not hinder God’s 144,000 Israelite first fruit brethren that now follow Jesus wherever He goes (Revelation 14:4).