Calendar Looking for a calendar for my Windows…

Calendar.
Looking for a calendar for my Windows 8.1 PC the most important part of this calendar is once launched it remains on the screen at all times. It will allow the setting of appointments and possibly flash when an event is coming due.
I have other calendars but they rely on emails to notify me when something is coming due and must be opened to interact with them.
The most important requirement; the calendar is always on my desktop while displaying my events showing upcoming events with some sort of active event allowing the viewer easily be alerted to that fact.