Open Calendar tab Select 'Menu app icon (3 lines)' > 'Print'

It is possible to print Events and/or Tasks in three options - List, Weekly Planner, Monthly Grid. You select the start and end Dates.

A print preview is shown.

You can restrict the print by selecting start and end date as the same. But at the moment you cannot specifically print one Event, unless there is only one event on the selected day.

There is a bug report on this, but no one seems to be acting upon it just yet. https://bugzilla.mozilla.org/show_bug.cgi?id=1732734

You could vote the bug.

I voted for this.

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