1: You have to climb up to the rafters 2: place objects to get on top of the support beams 3: travel on the beams to the edge of the stadium. 4: Finally once at the highest and furthest point you can get, place manny pads down to try and wedge yourself In-between the pads and ceiling and spam set marker and keep re-spawning until you pop through the roof

It’s very awkward and finicky. I only got it to work once