It doesn't have to be an official holiday right away, people could just wear a black band and explain this is to honor the innocents who have died under leftist socialist policies, like Hillary or Bernie's. Or in the case on this post the innocents in Venezuela who were mostly defrauded at the polls and lost their freedom, their nation and then finally their lives.
There is not a single leftist socialist tyrant in history who did not build their power on a mountain of skulls.