The great White Throne Judgement

How does the event in Revelation 20:11 differ from that in Revelation 7:9?
Also, how does it take place..?
"And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
12. I saw the dead, great and small, standing before the throne, and books were opened..."
Yes, the two judgments in the Bible are the Bema for believers (those who love and follow Jesus as Lord), and the Great White Throne Judgment, for those who do not believe in (trust) Jesus Christ.
The Bema Seat is the title given the Judgment Seat of Christ. It's for believers and is where the rewards are given.