Je vais me connecter à la visioconférence avant le dîner.

Je vais me connecter uses the near future: aller + infinitive. It means I am going to log in / connect.

• je me connecte = I connect / I am connecting
• je vais me connecter = I am going to connect

French often uses this structure when talking about something that will happen soon.

The verb is se connecter in French, which is commonly used in a reflexive form. So when the subject is je, it becomes me connecter.

• se connecter = to connect / to log in
• je vais me connecter = I am going to connect / log in

This is very natural French, especially for connecting to a system, platform, meeting, or network.

In the aller + infinitive structure, the reflexive pronoun usually goes directly before the infinitive.

So:

• je vais me connecter

not:

• je me vais connecter ❌

A useful pattern is:

• je vais me lever
• tu vas te préparer
• il va se coucher

So here, me belongs with connecter, not with vais.

The verb se connecter often uses à before what you are connecting to.

So:

• se connecter à un site
• se connecter à un compte
• se connecter à une réunion
• se connecter à la visioconférence

Here, visioconférence is a feminine singular noun, so à + la stays à la.

Compare:

• à le → au
• à les → aux
• à la → à la
• à l’ → à l’

Visioconférence means video conference or video call, depending on context.

It is a correct and standard French word. In everyday speech, people may also say things like:

• réunion en visioconférence
• appel vidéo
• sometimes even English-influenced terms in informal contexts

But visioconférence is perfectly natural and clear.

French often uses an article where English does not.

So:

• avant le dîner = before dinner
• après le travail = after work
• pendant la réunion = during the meeting

In French, le dîner refers to the meal as a noun phrase, so the article is normal.

Both are possible, but they mean slightly different things.

• avant le dîner = before dinner, before the meal
• avant de dîner = before having dinner / before eating dinner

So in your sentence, avant le dîner focuses on the time relative to the meal itself.
If you used avant de dîner, the emphasis would be more on the action of eating.

Usually, in modern standard French, le dîner means dinner, the evening meal.

But be aware that meal words can vary by region:

• In most of France today:
  • petit déjeuner = breakfast
  • déjeuner = lunch
  • dîner = dinner

In some regional or older usage, dîner can refer to a midday meal, but for most learners, dîner = dinner is the right understanding.

Yes, that is possible, but it is slightly different in nuance.

• se connecter à la visioconférence = to connect/log in to the video conference
• se joindre à la visioconférence = to join the video conference

The first focuses more on the technical act of connecting.
The second focuses more on participating in the meeting.

In many real situations, both could work.

Vais is pronounced roughly like vay.

So:

• je vais sounds approximately like zhuh vay

A few pronunciation notes for the whole sentence:

• Je = soft zh sound
• me connecter = muh koh-nek-tay
• visioconférence = the s sounds like z between vowels
• dîner = long ee sound in the middle

It is neutral and natural. You could use it in everyday conversation, at work, or in a normal written message.

It is not especially formal, but it is completely appropriate in professional contexts too.

For example, someone might say this before an online meeting:

• Je vais me connecter à la visioconférence avant le dîner.

That sounds normal and idiomatic.