Learn Croatian: Dogovorili smo izlazak u petak. - We arranged a date on Friday.

When you just say "we agreed" or "we arranged it" without specifying what, you use the reflexive dogovorili smo se. But here, you have a direct object receiving the action: izlazak (a date). When you directly state the specific thing being arranged, you drop the se.

I learned that izlazak means "exit". How does it translate to "a date"?

Izlazak literally means "the act of going out" or "an exit" (like a door). In everyday social contexts, it is the standard word used to mean a night out with friends or a romantic date, since Croatian doesn't have a direct equivalent for the English romantic "date".

What happens to the spelling of izlazak if we want to say we arranged multiple dates?

The accusative plural is izlaske. The second 'a' in izlazak is a "fleeting a" that disappears in most other forms. When it drops out, the 'z' gets pushed next to the voiceless 'k', so the 'z' changes into an 's' for easier pronunciation.

Why do we use the preposition u to mean "on" Friday?

In Croatian, days of the week always take the preposition u followed by the accusative case to express "on a certain day". Because petak is an inanimate masculine noun, its accusative form looks exactly like its basic dictionary form.