Για τη γιορτή φόρεσε σκουλαρίκια και ένα ασημένιο βραχιόλι.

It means for the celebration / for the party / for the occasion.

The preposition για usually means for.
So Για τη γιορτή sets the context: she wore these things for the celebration.

Depending on context, γιορτή can mean:

• a celebration
• a party
• a feast/festival
• sometimes even a name day celebration

Because για is followed by the accusative case.

The dictionary form is:

• η γιορτή = the celebration

But after για, it becomes:

• τη(ν) γιορτή = for the celebration

So:

• η γιορτή = nominative, used for the subject
• τη γιορτή = accusative, used after για

Both are related to the same article: την.

In modern Greek, the final -ν is often dropped before many consonants, so:

• την γιορτή
• τη γιορτή

Both can be seen, but τη γιορτή is very common and natural.

So τη here is just a shortened form of την.

Φόρεσε is the aorist (simple past) form of φορώ / φοράω, which means to wear or to put on.

Here it is:

• 3rd person singular
• so it can mean he wore / she wore / it wore, depending on context

In this sentence, it is usually understood as she wore.

A useful comparison:

• φοράει = she is wearing / she wears
• φορούσε = she was wearing / used to wear
• φόρεσε = she wore / she put on

Because Greek often drops subject pronouns when they are not needed.

The verb ending already shows that the subject is:

• 3rd person singular

So φόρεσε by itself can mean:

• he wore
• she wore

Greek does this very often. A separate pronoun like αυτή would only be added for emphasis or contrast.

It can suggest either, depending on context.

Literally, φορώ / φοράω is the verb used for wearing clothes, jewelry, shoes, etc.
Its aorist φόρεσε often refers to the completed action of putting something on, but in natural English it is very often translated as wore when the important point is what someone had on for an event.

So in this sentence:

• φόρεσε σκουλαρίκια... can be understood as she put on earrings...
• but English may more naturally say she wore earrings...

Both ideas are close here.

Because Greek often leaves out the article with an indefinite plural.

So:

• σκουλαρίκια = earrings / some earrings

If you added an article:

• τα σκουλαρίκια = the earrings

Here the meaning is indefinite, so no article is needed.

Also, σκουλαρίκια is the plural of:

• το σκουλαρίκι = earring

It is a neuter plural noun.

Because βραχιόλι is a neuter singular noun, and both the article and the adjective must agree with it.

Breakdown:

• ένα = a / one (neuter singular)
• ασημένιο = silver (neuter singular)
• βραχιόλι = bracelet (neuter singular)

So everything matches:

• ένα ασημένιο βραχιόλι = a silver bracelet

This is a very common Greek pattern:

• article + adjective + noun

Grammatically, it can mean either one or a/an.

Here, it most naturally means a:

• ένα ασημένιο βραχιόλι = a silver bracelet

If the speaker wanted to strongly emphasize the number, one, the context or intonation would usually make that clearer.

So in this sentence, you should mainly read ένα as the indefinite article.

Because in Greek, adjectives often come before the noun, especially in ordinary descriptive phrases.

So:

• ένα ασημένιο βραχιόλι = a silver bracelet

That is the most neutral, standard order.

Greek can sometimes place the adjective after the noun too, but before-the-noun is very common in simple descriptions like this.

Greek word order is more flexible than English word order.

This sentence starts with:

• Για τη γιορτή = For the celebration

That puts the occasion first and sets the scene.

A different order is possible, for example:

• Φόρεσε σκουλαρίκια και ένα ασημένιο βραχιόλι για τη γιορτή.

This would still be correct.
The original version simply gives a little more emphasis to the occasion right at the beginning.