According to the Tacoma Times one hundred years ago, there were active celebrations of Labor Day even amidst the WWI news.
But The Journal (of Burlington) in 1915 reported bank stockholder meetings and County fair activities but had no references to Labor Day as a holiday or event.
For more background on labor history here are few books
The fight in the fields : Cesar Chavez and the Farmworkers movement by Susan Ferriss and Ricardo Sandoval
The working poor : invisible in America by David K. Shipler.
Sweat and blood : a history of U.S. labor unions by Gloria Skurzynski.
Company towns of the Pacific Northwest by Linda Carlson.
Harvest Wobblies : the Industrial Workers of the World and agricultural laborers in the American West, 1905-1930 by Greg Hall.
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