The Houdini Serial, The Master Mystery, to be released on November 11th (Armistice Day) as opposed to November 4th, according to the following ad (Oct 26) from Motion Picture News:
As it turned out, the first showing of The Master Mystery was November 18th, 1918 in Boston.
That said, production plans have been shattered by the epidemic and the war. Peace means profits according to the following ads (Nov 16, Nov 30) from Motion Picture News:
Armistice Day (which coincides with Remembrance Day and Veterans Day, public holidays) is commemorated every year on 11 November. Please honor and remember those who have served in the Armed Forces.