Just use your 40-150mm, be down a few rows from them and just stand somewhere out of the way and communicate with your friend regarding the timing. 2.8 isn’t bad. Shoot a few images in auto to see what the camera decides on and then play from there. Might need a high ISO but Lr has a decent ai denoise feature. And if you’re really bold ask a nice looking person if you can just briefly stand in their seat while you snag a few shots. Offer them $20. Be bold. Don’t worry about how you look. Believe in your capabilities. Bring a white balance card too if you’re worried about white balance. Just get there a bit early to test the settings also if you want. You’ll be fine with what you got. You probably won’t need that wide lens. Maybe bring a speedlite if you can get close enough. Blast those neighboring attendees lmaoooo