So, I do try to consistently send out the latest current meeting invite details to this p4-dev email list within a day before each meeting, so this email list is one good place to get the latest meeting invite info, if it ever changes.
I also update the contents of a Google calendar event that is published on a calendar named "P4 Working Groups" that I believe anyone in the world can subscribe to if they have a free Google account. The "P4 Working Groups" calendar contains not only these meetings, but I believe all other P4.org working group meeting invites are also published on that same calendar..
If someone knows how to create an .ics file or other kinds of such invite file formats from the "P4 Working Groups" Google calendar, or since it sometimes is updated, how to subscribe to that calendar and updates to it in Outlook and/or other commonly used personal schedule maintenance programs, feel free to reply here. I suspect there are instructions for doing this an Internet search away.