Offsets

Two days before the date, or three hours after it ends.

In the free plugin Read the manual

Time-based triggers are not only "now". A reminder goes two days before the date, a thank-you three hours after it ends, a balance chase a week before the night.

What is waiting to be sent sits in the queue, where you can see it before it goes.

Offsets in the Eventnetic admin
From the plugin itself, not a drawing of it.