Option to filter month view to show only multi day events, all day events, starred events, holidays, and birthdays.

Option in event edit to "show in month view," and a status (not shown in month view with current filter settings).

Option to hide tasks, and some calendars ONLY in month view

The filters/hidden should only effect month view.

Ex.
My month view is unusable and confusing. I don't want it to show tasks, my spouses work calendar.