Hello Tory88, welcome to the Samsung Community. I understand your frustrations with your calendar app losing your events.
If you are unable to see an event in your Calendar app, your phone's sync settings may not be configured properly. Sometimes clearing data in your Calendar app can also help resolve the issue.
Navigate to and open Settings, then tap Connections, and then tap Wi-Fi or Data usage. Open the Calendar app, then tap Menu (the three horizontal lines), and then tap the Settings icon. Swipe to and tap About Calendar to view the software version.
Confirm if events are being added to the Calendar. You can check this by opening the Calendar app, then tapping Menu (the three horizontal lines), and then tapping Sync now to sync events from your calendars.
Make sure that the Calendar sync feature is enabled on all your devices. You should also check that auto sync is enabled on both your Samsung and Google accounts.
Navigate to and open Settings, then tap Accounts and backup, and then tap Manage Accounts. Tap the switch next to Auto sync personal data to turn it on. Then, select each of your accounts and adjust the sync settings as necessary to turn on the sync option for each account.
If you have additional calendars synced to the Calendar app, make sure they are visible. Navigate to and open the Calendar app, then tap Menu (the three horizontal lines), and then tap Manage calendars. Next, tap the switch next to your desired categories (such as My phone, Samsung account, Google, or App events) to display those calendars.
Navigate to and open Settings. Tap Apps, and then swipe to and tap Calendar. Tap Force stop, and then tap OK. Next, tap Storage, then tap Clear data, and then tap Delete. Reopen the app, allow it to sync, and check if you can see your events in Calendar.
If you still cannot see your events in the Calendar app, please repeat the above steps and submit an error report by going to the Samsung Members app > Get help > Send feedback > Error reports.
