Dimecres a la tarda, l'orquestra farà un altre assaig al teatre del centre.

In Catalan, days of the week often appear without a preposition where English uses on.

So:

• Dimecres = Wednesday / on Wednesday
• Dimecres a la tarda = Wednesday afternoon / on Wednesday afternoon

This is very normal in Catalan. You do not need a separate word for on here.

A few useful comparisons:

• Dimecres vindrà. = He/She will come on Wednesday.
• Dilluns al matí treballo. = I work on Monday morning.

If you use the article, the meaning can change slightly:

• dimecres = on Wednesday / this Wednesday depending on context
• el dimecres = on Wednesdays / every Wednesday in many contexts

A la tarda means in the afternoon.

It is a fixed time expression:

• al matí = in the morning
• a la tarda = in the afternoon
• al vespre = in the evening
• a la nit = at night

So:

• Dimecres a la tarda = Wednesday in the afternoon / Wednesday afternoon

This structure is very common in Catalan.

Because la becomes l' before a vowel sound.

Orquestra begins with o-, so:

• la orquestra → l'orquestra

This is called elision and it is very common in Catalan.

More examples:

• l'escola = the school
• l'amiga = the female friend
• l'òpera = the opera

So l'orquestra simply means the orchestra.

Farà is the future tense of fer (to do / to make). In this sentence, fer un assaig means to do / hold a rehearsal.

So:

• fa = does / makes
• farà = will do / will make

The sentence is talking about something that will happen in the future, so Catalan uses farà.

A quick mini-paradigm of the future of fer:

• faré = I will do
• faràs = you will do
• farà = he/she/it will do
• farem = we will do
• fareu = you all will do
• faran = they will do

The accent in farà shows the stress: fa-RÀ.

In Catalan, written accents often help show:

• where the stress falls
• sometimes the vowel quality

So the accent in farà tells you the last syllable is stressed.

Compare:

• fa = does / makes
• farà = will do / will make

That accent is an important part of the correct spelling.

Un altre means another.

Literally, it is made of:

• un = a / one
• altre = other / another

Together:

• un altre assaig = another rehearsal

This word order is normal in Catalan. You say:

• un altre llibre = another book
• una altra vegada = another time / again
• un altre dia = another day

Notice agreement:

• masculine singular: un altre
• feminine singular: una altra

So assaig is masculine, which is why we get un altre assaig.

Assaig means rehearsal in this sentence.

It can also mean essay in other contexts, so it is a word with more than one meaning. Context tells you which one is meant.

Here, because we are talking about l'orquestra, assaig clearly means rehearsal.

Useful related expressions:

• fer un assaig = to do / hold a rehearsal
• un assaig general = a dress rehearsal / final rehearsal

Because a + el contracts to al in Catalan.

So:

• a el teatre → al teatre

This is extremely common.

More examples:

• vaig al mercat = I go to the market
• som al carrer = we are on the street
• entren al cinema = they go into the cinema

So al teatre means to the theatre or at the theatre, depending on context. In this sentence, it is best understood as the location of the rehearsal.

Because de + el contracts to del.

So:

• de el centre → del centre

This is another very common contraction in Catalan.

So el teatre del centre literally means the theatre of the centre.

Depending on context, centre could mean things like:

• the town centre / city centre
• the centre of town
• a community or cultural centre
• an institution or venue called the centre

The exact nuance depends on the wider situation.

Catalan often uses definite articles in places where English may use fewer of them.

Here they are all natural:

• l'orquestra = the orchestra
• al teatre = at/to the theatre
• del centre = of the centre

Catalan generally likes explicit articles with specific nouns and locations. English sometimes sounds more natural with fewer articles, but Catalan usually keeps them.

So even if it feels article-heavy from an English-speaker's point of view, this sentence is perfectly normal Catalan.

The word order is flexible, but the original sentence is very natural.

Original:

• Dimecres a la tarda, l'orquestra farà un altre assaig al teatre del centre.

This begins with the time expression, which sets the scene first: Wednesday afternoon.

You could also say:

• L'orquestra farà un altre assaig al teatre del centre dimecres a la tarda.

That is also grammatical. It just places the time information later.

The comma after Dimecres a la tarda is normal because that opening time phrase is being set off from the main clause.

So the original order is natural because it emphasizes when the event will happen.

It depends on context.

In a sentence like this, Dimecres a la tarda usually means a specific Wednesday, often understood as this Wednesday afternoon or on Wednesday afternoon.

Catalan often leaves that specificity to context rather than spelling it out.

Compare:

• Dimecres a la tarda = Wednesday afternoon / on Wednesday afternoon
• Cada dimecres a la tarda = every Wednesday afternoon
• El dimecres a la tarda can also be used in recurring contexts, though cada dimecres is often clearer for every Wednesday

So in your sentence, the most natural reading is a particular upcoming Wednesday.

Literally, fer often corresponds to do or make, so a word-for-word translation might look like will do/make another rehearsal. But in natural English, we usually say:

• will have another rehearsal
• will hold another rehearsal

Catalan uses fer in many situations where English uses different verbs. That is very common and completely idiomatic.

So although the literal structure may look a little different from English, farà un altre assaig is a very natural Catalan way to say it.