I think we who are Saved by Christ, will undoubtedly be there as witnesses.
I think so as well.
Psalm 1: 1-6
Blessed is the one who does not walk in step with the wicked or stand in the way that sinners take or sit in the company of mockers, 2 but whose delight is in the law of the Lord, and who meditates on his law day and night. 3 That person is like a tree planted by streams of water, which yields its fruit in season and whose leaf does not witherâ whatever they do prospers. 4 Not so the wicked! They are like chaff that the wind blows away. 5 Therefore the wicked will not stand in the judgment, nor sinners in the assembly of the righteous. 6 For the Lord watches over the way of the righteous, but the way of the wicked leads to destruction.
We believers will sit upon the Judgment Seat of Christ, or the Bema seat, whereby we will be rewarded and our acts and works judged. But, as you know, this is not the same as what the unbelievers will endure. One pastor I heard gave the analogy that during a graduation, some receive high lauds and rewards for achievement. But everyone at the ceremony graduates. It will be like that. Some saints will be given many crowns for what they did in faith. But we are all already redeemed in Him.