Wir besuchen die Veranstaltung.

Because the verb has to match the subject.

• wir = we
• The infinitive is besuchen = to visit / to attend
• With wir, the verb form is besuchen

A quick pattern:

• ich besuche
• du besuchst
• er/sie/es besucht
• wir besuchen
• ihr besucht
• sie/Sie besuchen

So wir besuchen is the correct we form.

Because besuchen is a direct transitive verb in German. It takes a direct object without a preposition.

So German says:

• Wir besuchen die Veranstaltung.

Not:

• Wir besuchen zu der Veranstaltung.

This is similar to English We visit the museum, where the museum comes directly after the verb.

With besuchen, German often works this way:

• Ich besuche meine Großeltern.
• Sie besucht die Schule.
• Wir besuchen die Ausstellung.

Because Veranstaltung is a feminine noun.

Its basic article is:

• die Veranstaltung = the event

In this sentence, die Veranstaltung is the direct object, so it is in the accusative case. For feminine nouns, the accusative article is still die.

So:

• nominative: die Veranstaltung
• accusative: die Veranstaltung

That is why the article does not change here.

The object is the thing receiving the action of the verb.

In Wir besuchen die Veranstaltung:

• wir is the subject: the people doing the action
• besuchen is the verb: the action
• die Veranstaltung is what is being attended/visited, so it is the direct object

A useful test is to ask what are we attending?

Answer: die Veranstaltung

That shows it is the object.

It can mean both, depending on context.

Common uses of besuchen:

• to visit a person or place
  
  • Ich besuche meine Freundin.
  • Wir besuchen Berlin.
• to attend an event, school, course, etc.
  
  • Sie besucht einen Kurs.
  • Wir besuchen die Veranstaltung.

So in this sentence, attend is often the most natural English translation, even though the same German verb is used.

Yes. Veranstaltung is a fairly general word for an organized event.

It can refer to things like:

• a conference
• a concert
• a lecture
• a public event
• a formal gathering

It is a bit broader and often a bit more formal than some other words.

Related words:

• das Event = event, often modern or borrowed from English
• die Feier = celebration/party
• das Treffen = meeting/get-together

So Veranstaltung usually suggests some organized occasion.

Yes, but the conjugated verb usually stays in the second position in a normal main clause.

Standard order:

• Wir besuchen die Veranstaltung.

You can move something else to the front for emphasis:

• Die Veranstaltung besuchen wir.

This still means the same thing, but it sounds more marked, as if you are emphasizing the event.

What does not work in a normal statement is moving the verb out of second position:

• Wir die Veranstaltung besuchen. ❌

German main clauses usually follow the verb-second rule.

Here it is singular.

• singular: die Veranstaltung
• plural: die Veranstaltungen

So:

• Wir besuchen die Veranstaltung. = one event
• Wir besuchen die Veranstaltungen. = multiple events

The article die can be either feminine singular or plural, so you have to look at the noun ending:

• Veranstaltung = singular
• Veranstaltungen = plural

A simple pronunciation guide:

• wir ≈ veer
• besuchen ≈ beh-ZOO-khen
• die ≈ dee
• Veranstaltung ≈ fehr-AHN-shtahl-toong

A few useful notes:

• w in German sounds like English v
• v in Veranstaltung is pronounced like f
• ch in besuchen is the soft German ch sound
• ung at the end sounds like oong, not like English ung

Because German case marking is often shown by the article, not always by changing the noun itself.

Here:

• article: die
• noun: Veranstaltung

For many feminine nouns, the noun itself does not change in the accusative singular.

Compare:

• nominative: die Veranstaltung
• accusative: die Veranstaltung

But with masculine nouns, you often see the article change more clearly:

• nominative: der Kurs
• accusative: den Kurs

So in your sentence, the case is shown by sentence function and article pattern, even though the noun form stays the same.

Yes, but it means something slightly different.

• Wir besuchen die Veranstaltung.
  = We attend the event.
• Wir gehen zu der Veranstaltung.
  = We go to the event.

So gehen zu focuses more on going there, while besuchen focuses on attending or being present at it.

In many situations both can fit, but they are not exactly identical.

The infinitive is besuchen.

That is the form you look up in a dictionary.

In the sentence:

• besuchen is both the infinitive and the wir form

That happens with many German verbs. For example:

• infinitive: machen
• wir form: wir machen

So if you want to learn more forms, look up besuchen.

It is neutral and standard. There is nothing especially formal or informal about it.

• wir is just the normal word for we
• besuchen is a standard everyday verb
• Veranstaltung is a normal noun, though slightly more formal than a word like Party

So the sentence sounds perfectly natural in standard German.