We are cheaters at Numérique.ca.
Yes, we will cheat a little. Since the event module works in the same way as the news module, we invite you to read this tutorial.
Consult the tutorial "Add an event"
The only difference is that there is a publication date instead of the start date and end date of the event. In addition, you must check a category (if you have one).
Little trick: you can put a date in the future. At this date, your article will be published by itself!