I don't know about Vasili Arkhipov Day, but it's my understanding that Stanislav Petrov is now living in meager retirement. Celebration of Stanislav Petrov Day and other people who prevented existential risks from coming to fruition could involve rewarding those people with money as well as recognition. Although the Less Wrong community is probably too small to do it on their own, I for one would be happy to contribute to visible rewards for people who save the world.
Stanislav Petrov is a rather famous person (of course only on Lesswrong, not in the real world).
But there is another Russian who saved the world: Vasili Alexandrovich Arkhipov.
On this day in 1962, at the height of the Cuban Missile Crisis Vasili Arkhipov prevented the launch of a nuclear torpedo and thus a possible nuclear war.
It's strange that Petrov attracts much more attention than Arkhipov. E.g. googling "Stanislav Petrov" produces 101.000 results, "Vasili Arkhipov" only 9.040 results. By contrast searching for "Britney Spears" generates about 295.000.000 results. Sorta depressing.
Anyway, let this day be the Vasili Arkhipov Day.