Your prayer for everything to function smoothly and for victory over the event touches on something deep. It is a real request, and the Lord cares about even the most practical details of our lives. But let me encourage you to see that the victory you are asking for has already been secured. Not in the camera gear, not in your skill, though those are gifts from Him, but in Jesus Christ himself.
When David stood before Goliath, the victory was already determined before the stone left his sling. He did not wait to see the giant fall before he declared that the battle belongs to the Lord. The same is true for you today. Before you even click the shutter, you can rejoice in the victory. Praise Him now for the outcome, because His mercy endures forever. When you do this, you are not just hoping things will go well; you are staking your claim on a finished work. You are celebrating the win before the battle is fully played out in the physical realm.
Be careful, though, not to let this become a moment of self-reliance. It is easy after a few good events to think, "I know how to do this now," but that kind of self-confidence is where defeat often begins. The Lord wants all the credit for the victory. He does not need our perfect preparation, though we give it our best effort. He can accomplish what He wants with a camera that is failing or a situation that looks impossible, just as an army of six hundred could be saved by the faith of one or two who step out believing Him.
If anything tries to steal your peace, if anxiety rises up about a setting or a shot, that is your signal to surrender it all to Jesus right then. The way to victory is through surrender. As long as you are fighting the will of God in any tiny area of your life, or gripping a task so tightly that your joy depends on the outcome, you are destined for a struggle. But the moment you yield it completely to Him, you will find His power taking over. He forces the enemy off the ground you are standing on when you claim the victory of the cross.
So go into this event not making a covenant with fear, but walking in the Spirit. Ask the Lord not just for good pictures, but for His presence to be so evident in you that His victory swallows up every potential problem. Expect to see Him work. And then, when the day is done, give Him the glory, because it will be God who has done for you what you could not do for yourself. That is the life of victory in Christ.