Η συνάντηση γονέων και εκπαιδευτικών αρχίζει με ενημέρωση γονέων.

They are both in the genitive plural.

In η συνάντηση γονέων και εκπαιδευτικών, the genitive shows who the meeting is of / involving:

• γονέων = of parents
• εκπαιδευτικών = of teachers / educators

So the phrase literally looks like the meeting of parents and teachers, which naturally corresponds to the parent-teacher meeting.

Because it is doing two different jobs:

1. συνάντηση γονέων και εκπαιδευτικών
   = meeting of parents and teachers

2. ενημέρωση γονέων
   = briefing / information session for parents or informing parents

So the same word appears twice, but it belongs to two separate noun phrases.

Because η belongs to the main noun συνάντηση:

• Η συνάντηση = the meeting

The words γονέων και εκπαιδευτικών are modifiers of that noun, so they do not each need their own article here.

Greek often does this in formal or institutional phrases. This sentence sounds like a school notice or announcement.

Yes, it could, but the meaning becomes a bit more specific:

• Η συνάντηση γονέων και εκπαιδευτικών = a general parent-teacher meeting
• Η συνάντηση των γονέων και των εκπαιδευτικών = the meeting of the parents and the teachers, referring more clearly to specific groups already known in context

So the version without των sounds more like a standard label or event title.

Here it is a noun, not an adjective.

The dictionary form is εκπαιδευτικός, which can mean:

• educational as an adjective
• teacher / educator as a noun

In this sentence, εκπαιδευτικών means teachers / educators in the genitive plural.

Αρχίζει is:

• 3rd person singular
• present tense
• from the verb αρχίζω = to begin / start

It is singular because the subject is singular:

• Η συνάντηση = The meeting

So:

• Η συνάντηση αρχίζει = The meeting begins / starts

Because Greek, like English, often uses the present tense for scheduled events.

So αρχίζει can mean:

• begins
• is starting
• starts

In a timetable, notice, or program, this is completely natural.

Με means with, so:

• αρχίζει με ενημέρωση γονέων
  = begins with a parents’ briefing
  or starts with informing the parents

The phrase με ενημέρωση... tells you how the meeting begins or what the first part consists of.

Yes, με takes the accusative.

But ενημέρωση is one of those feminine nouns whose nominative and accusative singular look the same in the noun itself.

Compare:

• η ενημέρωση = nominative
• την ενημέρωση = accusative

The article changes, but the noun form ενημέρωση stays the same.

So after με, the case is accusative even though the word looks identical.

It can be understood as a genitive complement after the noun ενημέρωση.

In natural English, you would usually translate it as:

• briefing for parents
• information session for parents
• informing parents

So although the Greek form is genitive, the best English wording may use for rather than of.

Yes, in normal context that is the most natural translation.

Literally, it is more like:

• meeting of parents and teachers

But in everyday English, parent-teacher meeting or parent-teacher conference is usually the best equivalent.

Yes. Greek word order is more flexible than English.

This sentence uses a neutral, formal order:

• Η συνάντηση γονέων και εκπαιδευτικών αρχίζει με ενημέρωση γονέων.

But Greek could also say things like:

• Με ενημέρωση γονέων αρχίζει η συνάντηση γονέων και εκπαιδευτικών.

That version puts more emphasis on how it begins.

So the original order is natural, but not the only possible one.

A rough pronunciation guide:

• συνάντηση ≈ see-NA-dee-see
• γονέων ≈ go-NE-on
• εκπαιδευτικών ≈ ek-peh-thef-tee-KON
• αρχίζει ≈ ar-khi-ZI
• ενημέρωση ≈ eh-nee-ME-ro-see

The important thing is the stress:

• συνάντηση
• γονέων
• εκπαιδευτικών
• αρχίζει
• ενημέρωση

Yes, it sounds fairly formal and institutional, like something from:

• a school notice
• an event schedule
• an announcement to parents

A more everyday spoken version might use slightly simpler wording, but this sentence is completely normal Greek.