If a teacher or student has an asterisk by their name their calendar is set to private. Sometimes this is done by the Google Domain administrator for your organization (typically the case if you can't see anyone's calendar). To change this, your Google Domain Administrator can go to Apps> Google Workspace > Settings for Calendar > Sharing Settings and under "Internal sharing options for primary calendars" set globally for everyone to "Only show free and busy":
If you find that only a few people have not shared their calendar, they may adjust this individually:


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