saltlark

This needs a computer (the phone app doesn't show it). Go to calendar.google.com, point at your calendar on the left, tap ⋮ then Settings and sharing. Scroll to Integrate calendar and copy Secret address in iCal format. Email it to yourself, then paste it here on your phone. Work and school accounts sometimes have this switched off.

Open Calendar, tap Calendars at the bottom, then the ⓘ next to the calendar. Turn on Public Calendar and tap Share Link, then Copy. “Public” only means anyone holding the long link can see it; it isn't listed anywhere.

On outlook.com, open Settings, then Calendar, Shared calendars. Under Publish a calendar, choose the calendar and Can view all details, tap Publish, then copy the ICS link. Work accounts often have this switched off.

Treat the link like a password: anyone who has it can see your calendar. Saltlark saves it on this phone only. Each day the phone sends it to Saltlark's server, which reads today's events and keeps nothing. Events are never sent to the AI that writes your briefing.

To stop sharing completely, remove it here and reset it at the source: Google, Reset next to the secret address; iCloud, turn off Public Calendar; Outlook, Unpublish.