"What are they including in their dinner?"

Translation: Τι συμπεριλαμβάνουν στο δείπνο τους;

[beebica]

δείπνο; I'd be inclined to say βραδινό.

[jaye16]

Yes, both are correct. "Δείπνο" is perhaps a bit more formal but either could be used here. thank you for that feedback.