I use Focus time on my calendar to give my colleagues a reference of when to schedule meetings, so I have a separate time for individual contribution. This is only available for Google Workspace Accounts. But I don't need notifications for these events and I couldn't find a way to disable them. Currently there aren't any knobs for Focus time on:
- globally:
Settings
>Event settings
- globally:
Settings
>Notification settings
- specific recurrent event >
Edit event
Here is the official support page: Modify Google Calendar notifications