We recommend that you use a calendar like Google Calendar for your unit, and simply embed the calendar link right in the page. We recommend the "Agenda" view, which displays events in a list, ordered from earliest date to latest date, rather than a classical "tabular" calendar. But it's your choice.
However, if you insist on creating an agenda-style calendar using the Announcement Editor, you must be aware of the following strategies and best practices, in order to get your calendar to appear professional, and sorted in the right order:
The formatting in #2 is very important; if you want the events to more or less line up vertically, they you should assure that all dates are written with two digits (i.e., leading zero) and all months are abbreviated with three (3) characters.
The body of the announcement will normally be left empty, unless you have additional information to add. Be sure to keep the font sizes in the additional information at the default sizes. If you go larger, your page will look amateurish. And avoid brightly-colored fonts. Stick to the WOW pallette.