Έχοντας διαβάσει την αναφορά απόψε, θα πάω στη σύσκεψη πιο ήρεμος αύριο.

It means having read or after reading.

This is a non-finite structure used to show that one action is completed before the action in the main clause. So here, the reading happens first, and then the going to the meeting happens later.

A useful way to think of it is:

• Έχοντας διαβάσει... = having read...
• main clause = I will go...

So the sentence presents the reading as something completed in advance.

Because the sentence wants to emphasize completion.

• διαβάζοντας usually means reading / while reading
• έχοντας διαβάσει means having read / after having read

So:

• διαβάζοντας την αναφορά suggests the action is in progress or just describes the activity
• έχοντας διαβάσει την αναφορά clearly means the report will already be finished before the meeting

In this sentence, that completed action is important, because the speaker expects to feel calmer because the report will already have been read.

It is the same form you see in the perfect:

• έχω διαβάσει = I have read

In έχοντας διαβάσει, the word έχοντας combines with διαβάσει to create the idea having read.

For an English-speaking learner, the easiest practical way to understand it is:

• έχοντας = having
• διαβάσει = the completed form of read

You do not need to treat it like a normal tense by itself; it works together with έχοντας.

Because Έχοντας διαβάσει την αναφορά απόψε is an introductory participial phrase.

Greek often separates this kind of opening phrase from the main clause with a comma, just as English does in sentences like:

• Having read the report tonight, I’ll go to the meeting calmer tomorrow.

So the comma helps mark the transition from the background action to the main statement.

Because the speaker is talking about a future action.

• πάω by itself can mean I go / I am going
• θα πάω means I will go

Here the meeting is tomorrow, so the future marker θα is needed.

Also, θα πάω is the normal form for a single future action.
You would not normally use θα πηγαίνω here, because that suggests repeated or continuous action, not one specific trip to one meeting.

στη is a contraction of σε + τη.

So:

• σε τη σύσκεψη becomes στη σύσκεψη

This means to the meeting or at the meeting, depending on context.
With a verb like πάω, it naturally means to the meeting.

Also, after σε, Modern Greek uses the accusative case, so σύσκεψη appears as σύσκεψη here in the accusative singular with the article:

• nominative: η σύσκεψη
• accusative after σε: τη σύσκεψη
• contracted: στη σύσκεψη

Because ήρεμος here describes the speaker’s state, not the manner of the action.

• πιο ήρεμος = calmer as a person
• πιο ήρεμα = more calmly as an adverb

Greek often uses an adjective in sentences like this where English might also use an adjective:

• Θα πάω πιο ήρεμος = I’ll go calmer / I’ll go feeling calmer

If you said πιο ήρεμα, that would focus more on how the person goes, almost like describing manner.
But πιο ήρεμος means the speaker himself will be in a calmer state.

Yes. ήρεμος is the masculine singular form.

If the speaker were female, it would normally be:

• πιο ήρεμη

So:

• male speaker: θα πάω πιο ήρεμος
• female speaker: θα πάω πιο ήρεμη

This is a very common feature in Greek: adjectives often agree with the gender and number of the person they describe.

απόψε means tonight.

Yes, it can move, because Greek word order is fairly flexible. For example, you could also say:

• Απόψε, έχοντας διαβάσει την αναφορά, θα πάω στη σύσκεψη πιο ήρεμος αύριο.
• Έχοντας απόψε διαβάσει την αναφορά, ...
  though this sounds less natural

The original placement is natural because απόψε belongs closely with the reading action: it tells you when the report will be read.

Greek word order is flexible, so αύριο can often be moved. At the end, it sounds natural and helps close the sentence with the time of the main action.

The sentence separates the two time references neatly:

• απόψε goes with reading the report
• αύριο goes with going to the meeting

Putting αύριο at the end makes that contrast very clear.

Normally, yes.

In this kind of Greek participial construction, the understood subject of έχοντας διαβάσει is usually the same as the subject of the main verb.

So this sentence naturally means:

• I, having read the report tonight, will go to the meeting calmer tomorrow.

If you wanted a different subject, Greek would usually express it more explicitly with another structure, not this one.

It is natural, but it sounds a little more written or careful than the most everyday spoken version.

A more conversational version might be something like:

• Αφού διαβάσω την αναφορά απόψε, θα πάω στη σύσκεψη πιο ήρεμος αύριο.
• Θα διαβάσω την αναφορά απόψε και θα πάω στη σύσκεψη πιο ήρεμος αύριο.

The original sentence is perfectly good Greek, but έχοντας διαβάσει has a slightly more polished or formal feel than the simplest spoken alternative.