Remember that there are several ways to use the future
1. Compare:
I will work tomorrow. (future simple)
Decided now without any premeditation.
I am going to work tomorrow. (future with going to)
Premeditated future event.
I am working tomorrow. (future with present continuous)
Future with scheduling.

Using in the future
In English it is possible to use the present continuous to express the future when there is the notion of scheduling. A business appointment or a weekend activity are examples.

Structure
Remember the structure of the present continuous
Subject+Auxiliiary (to be)+Verb
I am leaving at 6PM.
I am not leaving at 6 PM.
Am I leaving at 6 PM?
Examples:
John is leaving tomorrow.
Jane is meeting the client today.