The most recent I have heard of was by some Best Buy employees. I understand that there are Facebook petitions that buyers and workers can sign, although I haven't been to any of those sites.
With the killing off of unions and the failure of government to intervene (government, after all, being now in the employ of the corporations that would compel workers to give up their holidays) there is really no reason why the big retailers cannot stay open all the time 24/7/365. To pay for the cost of this, they could pay their workers less under some guise that the government would accept as a waiver of the minimum wage laws.
Maybe Best Buy, for one example, could certify itself as a national security industry, and Walmart could certify itself as an arm of a foreign country, China, and therefore exempt itself from American law.
Let's just go back to an indentured servant economy; as the conservatives would say, "if you don't like it, don't take a job there."