ℹ Visibility — read this once

The iframe shows whatever the calendar exposes. Three cases:

1. Logged into Google in this browser → you see all your events as if you were on calendar.google.com (this is the most common case for you).
2. Calendar set to "Public · See all event details" → events visible to anyone (even logged-out). Good for the YGH shared calendar.
3. Personal Gmail calendar (private) → embed shows "This calendar can only be viewed by an authorized user" unless you're signed into the matching Google account in this browser tab.

The morning brief "📅 Today" row only pulls events from calendars whose public iCal feed is accessible. Personal/private calendars (like gustavs.gotauts@gmail.com) return 404 server-side, so they're silently skipped — events stay visible in the iframe below but won't appear in the brief.