Want to sync events that you've added to your Google Calendar account to your Android device? Follow these instructions to enable syncing on your Android Calendar app:
Open the Google Calendar app on your Android device.
In the top left, tap ☰ to open the menu.
In the menu, scroll down to the bottom and tap Settings ⚙.
Tap the name of the calendar (e.g. Nintendo Events) that isn't showing up. If you don't see the calendar listed, tap Show more.
At the top of the page, make sure the Sync switch is on (blue).
Note: It might take some time for your events to show up after you turn on sync.
Here's a quick walkthrough of what the process looks like: