On the module Event
- Go to Data => Event.
- Click on the button "Add event"
- Fill in the name, the description if necessary, and define your event.

A time period or a traceability range needs to be defined to create an event
On a chart/table/dashboard
- On a chart/table/dashboard, open the filter tab and click on "Add event".

- Fill in the name, the description if necessary, and put the conditions of your event.