A equipe empatou, e nós vamos comemorar.

Because equipe is a feminine noun in Portuguese, so it takes the feminine article a.

• a equipe = the team
• uma equipe = a team

This grammatical gender does not mean the team is female. It is just how the noun is classified in Portuguese.

In Portuguese, equipe is a collective noun. That means it refers to a group of people, but the noun itself is grammatically singular.

So Portuguese says:

• A equipe empatou. = The team tied.

Just like in English, team can be treated as one unit. Because of that, the verb is also singular:

• a equipe empatou
• not a equipe empataram

In Brazil, using the singular verb here is the normal choice.

Empatou is the preterite form of the verb empatar.

• empatar = to tie, to draw
• empatou = tied / drew

It is used especially in sports or games when neither side wins.

Examples:

• O jogo empatou? = Did the game end in a tie?
• O time empatou por 1 a 1. = The team drew 1–1.

In your sentence, empatou shows a completed past action.

Because it describes something that has already happened: the team already finished the game and the result was a tie.

Empatou is the simple past / preterite in Portuguese, used for a completed action in the past.

Compare:

• A equipe empata = The team ties / is tying
• A equipe empatou = The team tied
• A equipe empatava = The team used to tie / was tying

Here, empatou fits because the action is finished.

Vamos comemorar is a very common way to express the future in Brazilian Portuguese.

It is formed with:

• ir in the present tense + infinitive
• vamos
  • comemorar

So:

• nós vamos comemorar = we are going to celebrate / we will celebrate

Portuguese also has a simple future:

• comemoraremos

But in everyday Brazilian Portuguese, vamos comemorar sounds more natural and conversational.

So both are correct, but:

• nós vamos comemorar = more common in speech
• comemoraremos = a bit more formal or written

No. Portuguese often drops subject pronouns when the verb already makes the subject clear.

So both are possible:

• Nós vamos comemorar.
• Vamos comemorar.

Since vamos clearly means we go / we are going, the subject nós is already understood.

Including nós can add:

• emphasis
• contrast
• clarity

For example:

• A equipe empatou, e nós vamos comemorar.
  This can sound slightly more emphatic, like and we’re going to celebrate.

The comma is there because the sentence joins two clauses with different subjects:

• A equipe empatou
• nós vamos comemorar

In Portuguese, a comma before e is often used when the two parts have different subjects. So this punctuation is natural and correct.

If the subject were the same, the comma would be less likely:

• A equipe empatou e comemorou.

So in your sentence, the comma helps separate:

• what the team did
• what we are going to do

Comemorar means to celebrate.

It can take an object:

• comemorar a vitória = to celebrate the victory
• comemorar o gol = to celebrate the goal

But it can also appear without an expressed object when the reason for celebrating is already obvious from context.

So:

• Vamos comemorar. = We’re going to celebrate.

The sentence does not need to say exactly what is being celebrated, because it is already understood from the situation.

Yes, in many sports contexts, time is very common in Brazilian Portuguese.

So you could also say:

• O time empatou, e nós vamos comemorar.

The difference is roughly this:

• equipe = team, group; a bit broader or slightly more formal
• time = team, especially in sports; very common in everyday Brazilian Portuguese

Both work, but time is often the more natural choice when talking about sports.

Both are grammatically correct.

• vamos comemorar
• iremos comemorar

But in Brazilian Portuguese, vamos + infinitive is much more common in everyday language.

So:

• vamos comemorar = normal, natural, conversational
• iremos comemorar = correct, but more formal or less common in casual speech

A learner should get very used to this pattern:

• vou estudar
• vamos sair
• eles vão chegar
• nós vamos comemorar

Empatou is pronounced approximately em-pah-TOU, with the stress on the last syllable.

It ends in -ou because it is the third-person singular preterite ending for many -ar verbs:

For empatar:

• eu empatei
• você/ele/ela/a equipe empatou
• nós empatamos

So empatou matches the subject a equipe, which is singular.

This -ou ending is very common:

• falou = spoke
• chegou = arrived
• ganhou = won
• empatou = tied/drew