Below is an extended forecast for the days on which deployment slots on the calendar won't be made and weeks in which the deployment train will not run.
This is a naïve estimate based on the idea that any WMF holiday that does not fall on a Monday or a Friday makes the week a non-train week.
See also the calendar for 2022.
|What||When||Deployment decision||What happened?|
|New Year's Day||Mon 2 Jan||No deploys||No MW deploys|
|Martin Luther King Day||Mon 16 Jan||No deploys||1×Emergency MW deploy and 1×No-op|
|Presidents' Day||Mon 20 Feb||No deploys|
|Datacenter Switchover||Wed 1 Mar||Reserved window for the switchover, no deploys during it|
|Earth Day (observed)||Fri 21 Apr||No deploys (not that there are ever deploys on Friday)|
|Datacenter Switchback||Wed 26 Apr||Reserved window for the switchover, no deploys during it|
|Memorial Day||Mon 29 May||No deploys|
|Juneteenth||Mon 19 Jun||No deploys|
|WMF Holiday||Mon 3 Jul||No deploys|
|Fourth of July||Tue 4 Jul||No deploys|
|International Day of the
World’s Indigenous Peoples
|Wed 9 Aug||No Train, and no deploys that day|
|Labor Day||Mon 4 Sep||No deploys|
|Indigenous Peoples' Day||Mon 9 Oct||No deploys|
|Deployment freeze discussion reminder||Mon 13 Nov||Open discussion with deployers and stakeholders about backports week of Dec 18 (and partial weeks at the end of the year going forward)|
|Veterans' Day||Fri 10 Nov||No deploys (not that there are ever deploys on Friday)|
+ Day after Thanksgiving
|Thu 23 & Fri 24 Nov||No Train, and no deploys those days|
|End of Year Holiday||Mon 25 Dec–Mon 1 Jan||No Train or deploys|