После совещания мне вдруг захотелось тишины.

Because после meaning after requires the genitive case.

The dictionary form is совещание. After после, it changes to:

• после совещания = after the meeting

So this is a very standard pattern:

• после работы = after work
• после урока = after the lesson
• после совещания = after the meeting

Because Russian is using an impersonal construction here: мне захотелось.

Literally, this is closer to:

• to me, it became wanted
• or more naturally, I suddenly felt like...

So мне is in the dative case and marks the person who experiences the feeling or desire.

Compare:

• Я захотел тишины = I wanted silence / I decided I wanted silence
• Мне захотелось тишины = I suddenly felt like having some silence

The second version often sounds more spontaneous and less deliberate.

Захотелось is the past tense of захотеться, which is related to хотеться.

A useful contrast is:

• хотеть = to want
• хотеться = to feel like wanting, to want spontaneously
• захотеться = to suddenly start wanting, to feel like

So:

• Мне хочется спать = I feel like sleeping / I want to sleep
• Мне захотелось спать = I suddenly felt sleepy / I suddenly felt like sleeping

In your sentence:

• мне вдруг захотелось тишины = I suddenly wanted some silence / I suddenly felt like having silence

Because this is an impersonal sentence.

In Russian, impersonal verbs in the past tense are often put in the neuter singular form, even though there is no real subject.

So:

• захотелось is neuter singular past
• it does not agree with мне
• мне is just the experiencer in the dative

This is the same pattern you see in sentences like:

• Мне повезло = I was lucky
• Мне не спалось = I couldn't sleep
• Мне захотелось кофе = I suddenly wanted coffee

Because хотеться / захотеться often takes the thing wanted in the genitive case, especially with:

• abstract nouns
• mass nouns
• things wanted in a general sense

So:

• тишина = nominative, dictionary form
• тишины = genitive, the form used here

This gives the sense of wanting some silence or wanting silence in general.

Compare:

• Мне захотелось чая = I wanted some tea
• Мне захотелось покоя = I wanted peace
• Мне захотелось тишины = I wanted silence

Using тишину here would sound unnatural with захотелось.

Вдруг means suddenly, all of a sudden, or unexpectedly.

It shows that the feeling appeared quickly and not as part of a plan.

So the sentence is not just:

• After the meeting, I wanted silence

but more like:

• After the meeting, I suddenly wanted silence
• After the meeting, I was suddenly seized by a desire for silence

It adds a nice sense of spontaneity.

Usually, yes, but more specifically совещание often means a work meeting, briefing, or conference-style discussion, especially one focused on coordination or decision-making.

It is often more formal than встреча.

A rough comparison:

• совещание = meeting, briefing, staff meeting, conference
• встреча = meeting, encounter, appointment, get-together

So после совещания strongly suggests something like after the work meeting.

Yes, you could.

That sentence is grammatical and means roughly the same thing. But the nuance is a little different.

• Я вдруг захотел тишины sounds more direct and personal.
• Мне вдруг захотелось тишины sounds more natural for a spontaneous inner feeling that came over you.

Very roughly:

• Я захотел... = I wanted...
• Мне захотелось... = I suddenly felt like...

In everyday Russian, мне захотелось is very common when talking about sudden desires.

Yes, Russian word order is flexible, and moving words changes emphasis more than basic meaning.

This order is very natural:

• После совещания sets the time/context first
• мне introduces the experiencer
• вдруг highlights the suddenness
• захотелось тишины gives the main event

Other orders are possible, for example:

• Мне вдруг захотелось тишины после совещания
• После совещания вдруг захотелось тишины
• Тишины мне вдруг захотелось после совещания

These all keep roughly the same core meaning, but the emphasis shifts. The original version sounds neutral and smooth.