Sutra navečer imamo roditeljski sastanak u školi.

It means tomorrow evening.

• sutra = tomorrow
• navečer = in the evening / this evening period

Together, they form a time expression: sutra navečer = tomorrow evening.

Croatian often uses navečer as an adverb, so this is a very natural way to say when something happens.

Because navečer is an adverb, while večer is a noun.

• večer = evening
• navečer = in the evening

In this sentence, you need an adverbial time phrase, not just the noun evening by itself. So sutra navečer sounds natural, while sutra večer is not the standard way to express tomorrow evening here.

Croatian often uses the present tense for planned or scheduled future events, especially when there is already a clear future time expression such as sutra navečer.

So:

• imamo literally = we have
• in context, it means we have / we’re having / we’ve got

This is similar to English sentences like Tomorrow evening we have a meeting or We’re having a meeting tomorrow evening.

Because Croatian usually drops subject pronouns when they are not needed.

The verb ending already tells you the subject:

• imam = I have
• imaš = you have
• imamo = we have

So imamo already means we have, and adding mi would only be for emphasis or contrast.

Literally, it means something like parents’ meeting or parental meeting, but in normal English it usually corresponds to a parent-teacher meeting or a parents’ meeting at school.

The parts are:

• roditelj = parent
• roditeljski = parental / related to parents
• sastanak = meeting

So roditeljski sastanak is a set phrase commonly used for the kind of school meeting that parents attend.

Because roditeljski is an adjective, and it must agree with the noun sastanak.

Here:

• sastanak is masculine singular
• so the adjective also appears in masculine singular nominative form: roditeljski

That is why you get:

• roditeljski sastanak

If the noun were different in gender or case, the adjective form would change too.

It is in the nominative singular.

In this sentence, roditeljski sastanak is the thing that we have, so it appears in its basic dictionary form here:

• sastanak = nominative singular

A learner may expect some other case after imamo, but with imati in this kind of sentence, the noun is commonly in the accusative, and for this particular noun, the accusative singular is the same as the nominative because it is an inanimate masculine noun.

So:

• nominative: sastanak
• accusative: sastanak

They look identical.

Because u can take different cases depending on meaning:

• u + locative = location, in/at
• u + accusative = movement, into/to

Here the sentence tells you where the meeting takes place, not where someone is going. So it uses location:

• u školi = at school / in the school

If you were talking about motion, you would use u školu:

• Idemo u školu. = We are going to school.

It is the locative singular of škola.

• dictionary form: škola = school
• locative singular: školi

It is used here because of the preposition u meaning in/at, when describing location.

It can mean either, depending on context.

In this sentence, the most natural English translation is usually at school, because that is how English commonly talks about school events:

• We have a parent-teacher meeting at school tomorrow evening.

But literally, u školi is in the school.

Yes. Croatian word order is fairly flexible, especially because case endings show grammatical relationships.

The original sentence is very natural:

• Sutra navečer imamo roditeljski sastanak u školi.

But other orders are possible, for example:

• Imamo roditeljski sastanak u školi sutra navečer.
• U školi imamo roditeljski sastanak sutra navečer.

These variations can slightly shift emphasis, but the basic meaning stays the same.

Yes, very normal.

Croatian often uses imati + event noun in the same way English uses have:

• imamo sastanak = we have a meeting
• imam ispit = I have an exam
• imaju trening = they have practice/training

So imamo roditeljski sastanak is a completely natural phrase.

Yes. The sentence itself does not specify exactly who we are. It just says we have.

Depending on context, we could mean:

• the parents
• the family
• one parent and another person
• even a speaker including their spouse/partner

Croatian leaves that open unless the wider context makes it clear.

A fairly literal version would be:

Tomorrow evening we have a parents’ meeting at school.

A more natural English version might be:

Tomorrow evening we have a parent-teacher meeting at school.

So the Croatian sentence is very straightforward in structure, even if the best English wording may vary a bit.