This is the 35th most frequent Catalan word.
ens
"Ens" in Catalan means "us" or "ourselves."
In this sentence, 'ens' is used reflexively to indicate that the subject (we) is both performing and receiving the action of preparing.
Ens preparem per a la festa.
We prepare ourselves for the party.
'Ens' functions here as an indirect object pronoun, indicating the recipients of the action (us).
Ens ho portaran demà.
They will bring it to us tomorrow.
Here, 'ens' is the direct object pronoun, receiving the action of being inspired by 'Això' (this).