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This could be done via the validRange argument (https://fullcalendar.io/docs/validRange) argument in FullCalender. If you want to add that directly to the code it should work (you’d be looking for pgcalDefaults on line 56 of pgcal.js).
Note: this will get overwritten with any plugin updates.
If you’d like to see this feature added, please submit a ticket here: https://github.com/lbell/pretty-google-calendar/issues