These stamps were recently issued to commemorate something. What?

Cracked by everyone who attempted.

Sitterishness was deliberate (in the grand scheme of things it makes sense :P ).
Ananth, I didn’t realize I was petering this… Thanks for pointing it out!

p vs np, krudebox, achyuth, Pranav, tete80, shenoyvarun86, Johny Walker, Prabodh, Gurupad, eli, Debasish, Rogi, Raghuvansh, Shrey Goyal, Ram, Gaurav Jindal, emrohit, nishansolo, wanderlust, Nakul, madhur, joe, Chitananda, Higgers, Ajay Parasuram, BASAB, Ananth, Rithwik K, sandman, Hitesh, saurabh arora, Wasi Manazir, Deepthi JS, Logik, Aparna, Dibyo, superbrat, RajT, shenoyvarun86, akhi, prasanth, Advaith, abhijeet, Johny Walker, Gautam Dn(RV) and blackrat