Version 7 was just released!
The docs will be moved here soon.
Visit the external v7 docs site
showNonCurrentDates
In month view, whether dates in the previous or next month should be rendered at all.
Boolean, default: true
Days that are disabled will not render events.
When set to false in month view:

When set to true in month view (the default):

See Also
To customize the number of week rows displayed in month view, see fixedWeekCount.