Quick Join can fetch events directly from Google Calendar or from the macOS Calendar app.
Open Quick Join Settings. Under 'Fetch events', select 'Fetch events from Google Calendar'. Quit and restart the Quick Join app.
Once restarted, you should see a 'Click here to grant calendar access' button. Click the button and sign in with your Google account.
In this mode, Quick Join fetches events from all the calendars you added to the macOS Calendar app.
Ensure the calendars you want Quick Join to display are added to macOS. To do this, go to System Preferences → Internet Accounts and add your calendar accounts. If applicable, set a checkmark next to Calendars.
Open Quick Join Settings. Under 'Fetch events', select 'Fetch events from macOS Calendar app'. Quit and restart the Quick Join app.
Once restarted, you should see a 'Click here to grant calendar access' button. Click the button and allow access.
If you see an error message, go to System Preferences → Security & Privacy → Privacy → Calendars and set a checkmark next to Quick Join. Then, quit and restart Quick Join.
We are happy to help! Contact us at support@wegenerlabs.com if you need help with Quick Join.