to the 2025 calendar:
1) Login to Gmail or Google
2) go to/click on: Add to my calendar
You can also add the calendar by choosing Import, and giving this calendar ID:
37a4fc0f95d7f49fb257d9c5675011893d7d97fc1f5a48cdf5e5ed977b749bc0@group.calendar.google.com
For more import methods:
Import Calendars