Ravnateljica će na sastanku govoriti o sigurnosti djece ispred škole.

Ravnateljica is a feminine noun meaning female principal/headmistress/director, depending on the institution and context.

In this sentence, it is in the nominative singular because it is the subject of the sentence — the person who will be speaking.

The masculine form is ravnatelj.

Croatian often leaves out subject pronouns like ja, ti, on, ona when the subject is already clear.

Here, ravnateljica already tells you who is doing the action, so adding ona would usually be unnecessary.

So:

• Ravnateljica će govoriti... = The principal will speak...
• Ona će govoriti... = She will speak...
• Ravnateljica će ona govoriti... would sound odd unless you were emphasizing she in contrast with someone else.

This is very normal in Croatian and different from English, where the subject usually has to be stated.

This is the standard Croatian future tense (futur I).

It is formed with:

• a form of htjeti used as an auxiliary: ću, ćeš, će, ćemo, ćete, će
• plus the infinitive of the main verb

So here:

• će = will
• govoriti = to speak / to talk

Together:

• će govoriti = will speak / will talk

Some examples:

• Govorit ću. = I will speak.
• Oni će govoriti. = They will speak.

Notice that Croatian future tense word order can vary:

• Ravnateljica će govoriti...
• Govorit će ravnateljica...

Both are possible.

Croatian uses na with many events, gatherings, and occasions.

So:

• na sastanku = at the meeting
• na konferenciji = at the conference
• na predavanju = at the lecture

This is just the normal Croatian pattern.

Also, after na meaning location, the noun here is in the locative case:

• sastanak → na sastanku

So na sastanku literally means something like at/on the meeting, but the natural English translation is at the meeting.

Sastanku is locative singular.

The base form is:

• sastanak = meeting

After the preposition na when it means at/on/in a place or event, Croatian uses the locative:

• na sastanku = at the meeting

Compare:

• Idem na sastanak. = I’m going to the meeting.
  Here na sastanak is accusative, because it shows movement toward something.
• Ja sam na sastanku. = I am at the meeting.
  Here na sastanku is locative, because it shows location.

In your sentence, it is location/event context, so locative is used.

When govoriti means to speak/talk about something, it commonly takes the preposition o.

So:

• govoriti o sigurnosti = to talk about safety
• govoriti o školi = to talk about the school
• govoriti o problemima = to talk about problems

After o, Croatian uses the locative case.

So the pattern is:

• govoriti o + locative

That is why you get:

• sigurnost → o sigurnosti

Because of the preposition o.

The noun:

• sigurnost = safety / security

But after o, Croatian uses the locative case, so:

• o sigurnosti = about safety

This noun belongs to a group of feminine nouns that often end in -ost, and many of them have the same form in several cases:

• nominative: sigurnost
• genitive: sigurnosti
• dative: sigurnosti
• locative: sigurnosti
• instrumental: sigurnošću

So in this sentence, sigurnosti is locative singular.

Because djece is the genitive plural form of djeca (children).

Here, djece depends on sigurnosti and means of the children:

• sigurnost djece = the safety of children / children’s safety

The basic form is:

• djeca = children (nominative plural)

But when you want of children, Croatian uses the genitive plural:

• djece

This is a very common structure:

• zaštita djece = protection of children
• prava djece = children’s rights
• sigurnost djece = children’s safety

The preposition ispred means in front of and it requires the genitive case.

So:

• škola = school
• ispred škole = in front of the school

That is why škola changes to škole.

Other examples:

• ispred kuće = in front of the house
• ispred zgrade = in front of the building
• ispred trgovine = in front of the shop

So the pattern is:

• ispred + genitive

In this sentence, the most natural reading is that ispred škole goes with sigurnosti djece:

• govoriti o sigurnosti djece ispred škole
• talk about the safety of children in front of the school

So the topic is specifically children’s safety in front of the school.

Grammatically, Croatian can sometimes allow a little ambiguity in where a phrase attaches, but in this sentence the meaning is most naturally:

• not the principal will speak in front of the school
• but the principal will speak about safety in front of the school

If you wanted to make the place of speaking clearer, you could say something like:

• Ravnateljica će govoriti ispred škole. = The principal will speak in front of the school.

If you wanted to make the topic clearer, you could also say:

• Ravnateljica će na sastanku govoriti o sigurnosti djece koja su ispred škole.
  But that changes the meaning slightly.

So in your original sentence, ispred škole is best understood as part of the topic being discussed.

Yes. Croatian word order is more flexible than English word order.

Your sentence:

• Ravnateljica će na sastanku govoriti o sigurnosti djece ispred škole.

Possible alternatives:

• Na sastanku će ravnateljica govoriti o sigurnosti djece ispred škole.
• O sigurnosti djece ispred škole ravnateljica će govoriti na sastanku.
• Ravnateljica će govoriti na sastanku o sigurnosti djece ispred škole.

These versions are not identical in emphasis, but they are all grammatical.

In general:

• what comes earlier is often a bit more emphasized or treated as known/topic information
• the verb clitic će usually stays in second position in its clause

That is one reason Croatian word order can feel unusual to English speakers.

It can be translated as either speak or talk, depending on context.

Here:

• govoriti o nečemu often means to talk about something
• but in a more formal setting, English might prefer speak about or address

Since the sentence includes na sastanku (at the meeting), the tone is fairly formal, so natural English translations could be:

• The principal will speak about children’s safety in front of the school.
• The principal will talk about children’s safety in front of the school.
• The principal will address the issue of children’s safety in front of the school.

So govoriti is broad and flexible.

It is plural.

The noun djeca (children) is a little irregular and often surprises learners.

Important forms:

• djeca = nominative plural = children
• djece = genitive plural = of children
• djeci = dative/locative plural = to/about children
• djecu = accusative plural = children
• djecom = instrumental plural = with children

So even though djece does not look obviously plural to an English speaker, it definitely is.

Yes, the sentence is natural and grammatical.

It sounds like a normal formal statement, especially in a school context.

A speaker might also say:

• Ravnateljica će na sastanku govoriti o sigurnosti djece pred školom.

Here pred školom can also mean in front of the school. Both ispred škole and pred školom are possible, though ispred škole is often more specifically physical and explicit.

So your sentence is perfectly fine and natural.