El dia de la festa, la meva filla vol portar la faldilla vermella.

In Catalan, possessives are very often used together with the definite article. So la meva filla is the normal way to say my daughter.

A few examples:

• el meu pare = my father
• la teva casa = your house
• els nostres amics = our friends

So even though it looks like the my daughter word-for-word, that is just standard Catalan grammar.

Literally, El dia de la festa means the day of the party/celebration.

Catalan often uses de where English might use:

• of → the day of the party
• or sometimes a more natural English phrasing like on the day of the party

Here:

• el dia = the day
• de la festa = of the party / of the celebration

So de is linking day and party.

It is placed first to set the scene: On the day of the party...

This is very natural in Catalan, just as it is in English. It gives the time context before the main statement.

You could also say:

• La meva filla vol portar la faldilla vermella el dia de la festa.

That is also correct, but beginning with El dia de la festa gives a slightly more natural narrative flow in this sentence.

Because vol means wants, and portar is the infinitive to wear / to carry / to bring.

So:

• vol = wants
• portar = to wear

Together:

• vol portar = wants to wear

This is similar to English:

• She wants to wear...

Catalan does not need a separate word equivalent to English to before the infinitive in this construction.

Yes, portar can mean several related things depending on context:

• to carry
• to bring
• to wear

In this sentence, because the object is clothing (la faldilla vermella), portar means to wear.

For example:

• Porta una motxilla. = He/She is carrying a backpack.
• Porta vi. = He/She brings wine.
• Porta una faldilla. = He/She is wearing a skirt.

So the object tells you which meaning is intended.

In Catalan, adjectives usually come after the noun.

So:

• la faldilla vermella = the red skirt

This is the normal order:

• noun + adjective

Other examples:

• una casa gran = a big house
• un cotxe blau = a blue car
• una camisa blanca = a white shirt

Some adjectives can sometimes come before the noun for stylistic or special meaning reasons, but in basic descriptive use, after the noun is the standard pattern.

Because they agree with feminine singular nouns.

In the sentence:

• filla is feminine singular
• faldilla is feminine singular

So the words that describe or go with them also take feminine singular forms:

• la meva filla
• la faldilla vermella

Compare:

• el meu fill = my son
• la meva filla = my daughter
• el jersei vermell = the red sweater
• la faldilla vermella = the red skirt

This kind of agreement is very important in Catalan.

The ll in Catalan is traditionally a sound similar to the lli in some pronunciations of million, though exact pronunciation varies by dialect.

A practical learner-friendly approximation is:

• filla ≈ FEE-ya
• faldilla ≈ fal-DEE-ya or fal-DI-lya, depending on accent

A few helpful points:

• filla has stress on the first syllable: FI-lla
• faldilla has stress on di: fal-DI-lla

In some modern varieties, the ll sound may be pronounced more like y, while in others it is kept more distinct.

Festa is a flexible word. Depending on context, it can mean:

• party
• celebration
• festival
• feast day in some contexts

In this sentence, the most natural translation is probably party or celebration.

So:

• El dia de la festa = On the day of the party/celebration

The exact English word depends on the situation, but the Catalan itself is perfectly natural.

In this sentence, the articles are natural and expected.

• la festa refers to a specific party or celebration
• la faldilla vermella refers to a specific red skirt, not just any red skirt

So the definite articles help show that both are specific and known in context.

If you changed the sentence, you could get different meanings:

• vol portar una faldilla vermella = she wants to wear a red skirt
• vol portar la faldilla vermella = she wants to wear the red skirt

So the article matters a lot.