How to use a calendar template in Google Docs to keep track of detailed or long-term schedules

You can use calendar templates in Google Docs, but Google doesn't offer any in its built-in template library.
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Google Workspace: How to use the Meeting Notes feature in Google Docs

Taking, organizing, and sharing meeting notes with other participants is a big job. Google Docs' meeting notes make storing and organizing details unique to a new or existing calendar event easier.