The paper reading lunch isn't for everyone. It's simply for those with interests in academia, as a career, which is a subgroup of people in NUS Hackers.
(E.g. Angad, Shawn, Davin).
Of course, the idea is to have it open to anyone, so if you want to attend, the only thing that's required is that you do the reading for the week. Think of it as a way to get exposed to new ideas. Which is the way Stripe does it, because they think it's still good to have their engineers exposed to cutting-edge research.
Besides, I'm really looking forward to have the Nintendo Games are NP-Hard discussed by people more knowledgeable about computational theory than myself.
Ced