Na Páscoa, eu vou festejar com a minha família.

Na is a contraction of em + a.

• em can mean in, on, at, or during, depending on context.
• a is the feminine singular definite article the.

Because Páscoa is treated as a feminine noun, em a Páscoa becomes na Páscoa.

So na Páscoa means at Easter or during Easter.

A similar pattern:

• no Natal = at Christmas
• na primavera = in spring

The phrase Na Páscoa has been moved to the front to set the time first: At Easter, ...

That kind of fronted time expression is often followed by a comma, especially in writing. It helps separate the time phrase from the rest of the sentence.

So:

• Na Páscoa, eu vou festejar com a minha família. = perfectly natural
• Eu vou festejar com a minha família na Páscoa. = also correct, just a different word order

Yes, very often eu is optional, because the verb already shows the subject.

Here:

• vou already means I go / I am going

So you could say:

• Na Páscoa, vou festejar com a minha família.

That would still clearly mean I.

Including eu can:

• add emphasis
• make the subject extra clear
• sound a little more explicit

So both versions are correct.

Vou festejar is a very common future structure in Portuguese:

• vou = present tense of ir (to go)
• festejar = infinitive (to celebrate)

Together, vou festejar means I’m going to celebrate.

This is often called the near future or periphrastic future. It is extremely common in everyday speech.

Both are grammatically correct, but they do not feel equally natural in everyday conversation.

• vou festejar = very common and natural in spoken Portuguese
• festejarei = correct, but more formal, literary, or less conversational

In modern European Portuguese, just like in English, people often prefer the going to type of future for ordinary speech.

So this sentence sounds very natural:

• Na Páscoa, eu vou festejar com a minha família.

They are close, but not always identical.

• festejar usually suggests celebrating in a festive way, enjoying the occasion, marking it happily
• celebrar is often a bit more neutral or formal: to celebrate, to observe, sometimes even to hold a ceremony

In this sentence, festejar sounds warm and natural, especially for a family holiday.

Examples:

• Vou festejar o meu aniversário. = I’m going to celebrate my birthday.
• Vamos celebrar a Páscoa. = We’re going to celebrate Easter.

Both can work, but festejar sounds a bit more lively here.

In European Portuguese, it is standard to use the definite article before a possessive in many cases.

So:

• a minha família = my family
• o meu carro = my car
• a nossa casa = our house

That is why com a minha família is the expected European Portuguese form.

A learner may notice that in Brazilian Portuguese, people often say:

• com minha família

But for Portuguese from Portugal, com a minha família is the safer and more standard choice.

Because they agree with família, which is a feminine noun.

Portuguese articles and possessives usually agree in gender and number with the noun:

• a minha família = feminine singular
• o meu irmão = masculine singular
• as minhas amigas = feminine plural
• os meus pais = masculine plural

So here:

• família is feminine
• therefore you use a
• and also minha

Yes. Portuguese allows some flexibility in word order.

These are all possible:

• Na Páscoa, eu vou festejar com a minha família.
• Eu vou festejar com a minha família na Páscoa.
• Na Páscoa, vou festejar com a minha família.

The meaning stays basically the same, but the emphasis changes a little:

• starting with Na Páscoa highlights the time
• starting with Eu highlights the subject
• leaving out eu often sounds a bit more natural unless emphasis is needed

Good question. Festejar can be used both ways.

1. With a direct object

   • Vou festejar a Páscoa.
   • Vamos festejar o aniversário dela.

2. Without a direct object, when the occasion is already understood from context

   • Na Páscoa, vou festejar com a minha família.

In your sentence, the holiday is already mentioned in Na Páscoa, so the object does not need to be repeated. That makes the sentence sound natural and not repetitive.

A rough European Portuguese pronunciation is:

Na Páscoa, eu vou festejar com a minha família.
IPA: [nɐ ˈpaʃkwɐ ew vo fuʃtɨˈʒaɾ kõ ɐ ˈmiɲɐ fɐˈmiljɐ]

A few helpful points:

• Páscoa is stressed on PÁS
• festejar is stressed on the last syllable: -jar
• família is stressed on mí
• eu in European Portuguese is a short diphthong, roughly like ehw
• unstressed vowels are often reduced more in Portugal than in Brazil

A stress guide:

• na PÁS-coa
• eu vou fes-te-JAR
• com a minha fa-MÍ-lia