If you are trying to add an event and it doesn't show it in your Opus One, please try to verify all steps below:
1) Did you already add the Calendar on your Calendar app first?
I mean here:
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/33054525792/original/qhG6xh7fBFBaeYJEy5HseDysnthbas7rTA.png?1614030691)
2) Make sure you select your Default Calendar on Opus One
You need to go to your Opus One>Preferences>Calendar>Default Calendar
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/33054525810/original/xz6rc8J7C6KPBU9cvb94wMKrd3-6zpWavA.png?1614030700)
3) Make sure your Calendar is not Hide in your Opus One and Calendar App
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/33054525784/original/pPnVy8zH5QRpow_KBTk1gWkPJJ6AQfWN8g.png?1614030679)
4) Verify permission on your Calendar
In order to do that, please go to "system Preferences">Security&Privacy>Calendar
Make sure Opus One is selected.
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/33054525787/original/E-oDEnU64ozHMNVkHMgasrHhBCG2uz7nRg.png?1614030688)