nope, I probably wouldn't add a Holiday. I'd rather substitute the religious holidays to secular ones.
Oh wait I got one,
Refugees Day! I was thinking about marking one for
Aristides de Sousa Mendes (wiki) where he was able to save a lot of jews from nazi persecution, but then again I'd rather people to focus on the real issue which is pretty much Refugees, if people can value the refuge they can give those without a home then maybe they wouldn't say stupid shit about the current refugee crisis.
Sousa Mendes died in poverty on April 3, 1954, owing money to his lenders and still in disgrace with his government.