How to sync multiple calendars
Step 1: First go to your Google Calendar page
Step 2: Scroll down to “My Calendars”
Step 3: Click on “Other calendars”
Step 4: Subscribe to calendar (image below)
Step 5: To add a second calendar, please click on “Subscribe to calendar” and type in the email address you’d like to sync.
Once you add the calendar, you will then need to grant access from that account.
Step 6: Once you grant access, head back to settings for other calendars and enable event notifications so you get notified for events on your second calendar, image below (example).
Step 7: Select what you would like to get notified from the above list (example).
Voila! You are all set!