Check that Calendar is synced
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Open the Google Calendar app.
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In the top left, tap Menu.
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Tap Settings.
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Tap the name of the calendar that isn't showing up. If you don't see the calendar listed, tap Show more.
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At the top of the page, make sure Sync is on (blue). You'll only see the Sync setting for calendars you've created, but not your primary calendar (this is usually called "Events" unless you've changed its name).
Note: It might take some time for your events to show up after you turn on sync.
Make sure Calendar storage is turned on
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Open the Settings app on your device (not the "Google Settings" app).
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Tap Apps or Apps & notifications App info.
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In the top right, tap More Show system Calendar storage.
Check your device's storage
Calendar stops syncing if your device is running out of storage.
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Open the Settings app on your device (not the "Google Settings" app).
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Find the Storage section.
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If you need to clear space, try uninstalling apps you don't use or deleting files or photos from your device.
Clear your Calendar app data
Important: These steps may cause you to lose some unsynced data. Any event information you can't see on Google Calendar on your computer will be lost. Only try these steps if nothing else above worked.
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Open the Settings app on your device (not the "Google Settings" app).
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Tap the Apps or Apps & notifications section. You may need to scroll down or go to a different page in settings.
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Tap App info to view the list of all apps.
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Select Calendar.
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Tap Storage Clear data OK.
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If you see "Calendar Storage" in the list, clear data for that app too.
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Turn off your device, then turn it back on again.