Multiple Calendars Selector
Allows quickly displaying just the set of calendars you want
Screenshots

Hunter's comment
With this Google Calendar extension for Chrome, you'll define presets of multiple calendars that can be displayed or hidden with one click. You will be able to switch between them easily.
Useful for viewing a team's or several conference rooms' availability.
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If you are a secretary and you need to manage schedules for multiple people, this extension is handy.
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