I wish to upgrade the version of WordPress that this site uses. Doing so will put the site into “Maintenance mode” during which you can neither see nor write content. I estimate the duration of this maintenance will be substantially less than half an hour and I propose to do this on the morning of Sunday April 12, at around 9 AM.
The upgrade will not affect how the site works or appears after it is complete. It adds a few new features of interest to site authors and admins, and of course corrects many existing bugs and security issues.
If this will cause you any problems, please leave a comment below.