Facing a big issue with Birthday reminders / birthday calendar events showing in the Garmin Calendar Widget despite having removed them from every other iCloud / iCal / Google Calendars.
I spent hours trying to find a fix. It looks like the Garmin Calendar Widget just keeps those birthday calendar memorized and does not give an option to deactivate them (I am 100% sure I deactivated them in all other iOS calendars on iPhone, Mac, Google Calendars.
The problem is that the Garmin Calendar Widget becomes unusable, since it displays 2 to 5 contacts birthdays every single day on the watch.