Note that if one is a "Museum Member", then a Google Calendar is available in the "Museum Discussion - MEMBERS ONLY" section of this forum, and it shows the 2020 SWW along with other WW&F events. That Calendar can also be added to your "own" calendar if you are a Google Calendar user.
I'd include a direct link, but that section of the forum is only available to Museum members, and not all forum readers are Members. Start at the forum Home page here:
http://forum.wwfry.org/index.php Once you get into the "Museum Discussion - MEMBERS ONLY" section, the calendar is the 2nd topic down in the main part of that sub-forum.
UPDATE 1/10/20:
After using Google Calendar with the WW&F download for a while, I realized that it would be smarter

to have the WW&F events shown on my calendar, but not co-mingled with my 'personal' entries. By adjusting the settings a bit, I now have it set so that the WW&F events are shown on my calendar, but are in a different color than my 'personal' events, and the WW&F events can be temporarily hidden if needed by just un-clicking the WW&F checkbox.