Document official Google calendar

.github/CODEOWNERS

@@ -24,3 +24,4 @@
 /doc/values.md @NixOS/steering
 /doc/constitution.md @NixOS/steering
 /doc/nixpkgs-committers.md @Mic92 @NickCao @jtojnar
+/doc/calendar.md @edolstra @grahamc @rbvermaa @garbas @tomberek

README.md

@@ -26,3 +26,4 @@ For contributing see [here](./CONTRIBUTING.md).
 - [Governance](./doc/governance.md)
   - [Nix Governance Constitution](./doc/constitution.md)
   - [Nix Community Values](./doc/values.md)
+- [Calendar](./doc/calendar.md)

doc/calendar.md

@@ -0,0 +1,16 @@
+# Calendar
+
+There is [this official Google Calendar](https://calendar.google.com/calendar/u/0/embed?src=b9o52fobqjak8oq8lfkhg3t0qg@group.calendar.google.com) ([ics](https://calendar.google.com/calendar/ical/b9o52fobqjak8oq8lfkhg3t0qg%40group.calendar.google.com/public/basic.ics)).
+
+These Google accounts have access to manage permissions (and make changes to events):
+<!-- Keep this list in sync with the codeowners of this file! -->
+- edolstra@gmail.com (@edolstra)
+- graham@determinate.systems (@grahamc)
+- rob.vermaas@gmail.com (@rbvermaa)
+- rok.garbas@gmail.com (@garbas)
+- tomberek@gmail.com (@tomberek)
+
+These people's Google following people can only make changes to events:
+- valentin.gagarin@moduscreate.com (@fricklerhandwerk)
+- silvan.mosberger@moduscreate.com (@infinisil)
+- nixpkgs-architecture@infinisil.com (@infinisil)