Dependent Events
Preceden's Dependent feature lets you specify that one event should start when another event ends.
For example, in this timeline Event B starts when Event A ends:

There are two ways to go about this:
Manually Set the Start Date for Event B
With this approach, you set Event B's start date by hand to June 8, 2022, matching when Event A ends.

Mark Event B as a Dependent of Event A
To do this, click Event B on your timeline (or its name in the list below the timeline) to open the Update Event dialog, check the Dependent box, then select Event A from the dropdown:

The advantage of this approach is that if you change Event A's dates, Event B's dates will automatically update to start when Event A ends:

FAQs
How are dependents and connections related?
When you specify that Event B is a dependent on Event A, Preceden will automatically add a visual connection between the two events by default:

However, you can go into Event B's More Options and remove the connection to Event A if you would prefer the events not to be visually connected on the timeline.
Adding a connection between two events is separate from the Dependent feature: events can be connected without one depending on the other.
What happens if I delete Event A?
Preceden gives Event B a fixed start date matching Event A's end date, or Event A's start date if it had no end date.