The end of WW1 was on 11/11/1918. The National WW1 Museum in Kansas City, MO will commemorate the end of the "Great War" with its final special event on Nov 3/4.
This series of special events started in 2014 to commemorate the beginning of the war. Tens of thousands of contacts have been made throughout the world. Over 250 ham operators from Kansas City and other locations have participated in this once-in-a-lifetime series of events.
Join us this coming weekend for the final event. 20M SSB, CW, FT8, likely also 40M. More at
https://www.theworldwar.org/amateurradio . Also check out the four page article in Feb 18 issue of QST. Special QSL card or certificate is available.