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In Google Calendar, one can quickly build up a long list of calendars that you look at and compare.  The quickest way to make the biggest impact on your display of calendars is to show or hide individual ones.  Very easy.

1.  In your Calendar list, find the calendar you'd like to hide, and click on the checkbox to hide it.

2.  None of that calendar's events are displayed.  Click again to bring it back.