Navigate to the Litigation Tab in the open case.

Under Events, locate the event you want to edit.

Click on the arrow at the end of the event row.

Choose Edit from the drop-down menu.

A pop-up window will appear.

Make the desired edits.

Click Save in the bottom right of the pop-up window.

Your changes will be reflected on the tab. The event will also appear on the case calendar, and on the calendar for any users assigned to the event.