Este nagy buli lesz itt.

Because lesz is the future form of lenni (to be).

In this sentence:

• van = is
• lesz = will be

So nagy buli lesz means there will be a big party / it will be a big party depending on context.

Hungarian uses different stems for to be:

• present: van
• past: volt
• future: lesz

So this is normal, even though it may look unrelated to van at first.

Here este means in the evening or tonight, depending on context.

It is very commonly used as a time expression without any extra ending:

• Reggel = in the morning
• Délben = at noon
• Este = in the evening / tonight

So Este nagy buli lesz itt naturally means something like There will be a big party here tonight.

A learner often expects something like in the evening with a preposition, but Hungarian often uses a simple time word instead.

Hungarian often leaves out egy (a/an) when English would use an indefinite article.

So:

• nagy buli = a big party / big party

In many sentences, especially when introducing what something will be, Hungarian does not need egy.

You could say:

• Este egy nagy buli lesz itt.

But that sounds a bit more specifically like there will be a certain big party here tonight or gives slightly more emphasis to the noun phrase.

The version without egy is very natural.

Hungarian word order is much freer than English word order. The position of words often shows topic, focus, or emphasis, not just grammatical function.

In:

• Este nagy buli lesz itt.

the final itt is perfectly natural. It places here a little later, almost as added location information: Tonight, there’ll be a big party here.

Other orders are also possible, with slightly different emphasis:

• Itt este nagy buli lesz. = Here, there will be a big party tonight.
• Este itt nagy buli lesz. = Tonight, here there will be a big party.

All are possible; the difference is mainly what is highlighted.

In natural English, the best translation is usually:

• There will be a big party here tonight.

Hungarian does not need a dummy subject like English there in there is / there will be.

So the Hungarian structure is more direct:

• nagy buli lesz = literally big party will-be

But idiomatically, English usually says there will be a big party.

Hungarian usually does not use subject pronouns unless they are needed for emphasis or contrast.

Also, English there in there will be is not a real subject in the same way. Hungarian simply does not need it.

So instead of saying something equivalent to There will be..., Hungarian just says:

• Nagy buli lesz.

The verb ending and the sentence structure are enough.

The dictionary form is lenni, meaning to be.

This verb is irregular, so its forms come from different-looking stems:

• lenni = to be
• van = is
• lesz = will be
• volt = was

This is one of the most important verbs in Hungarian, so it is worth memorizing as a special case.

Buli is a common, everyday, slightly informal word for party.

It usually suggests something social and fun, like:

• a house party
• a student party
• a lively gathering

It is not very formal. In more formal situations, other words may be used, such as ünnepség or rendezvény, depending on the context.

So nagy buli sounds natural and conversational: a big party.

Yes, absolutely.

• Este = in the evening / tonight
• Ma este = this evening / tonight, more explicitly

So:

• Este nagy buli lesz itt.
• Ma este nagy buli lesz itt.

Both are correct. Ma este just makes the time clearer and more explicit.

A simple approximate pronunciation is:

• Este ≈ ESH-teh
• nagy ≈ nodj or nudge with a soft dy sound
• buli ≈ BOO-lee
• lesz ≈ less
• itt ≈ it with a longer, firmer t

A rough full pronunciation:

ESH-teh nodj BOO-lee less itt

A few useful notes:

• s in Hungarian is pronounced like English sh
• sz is pronounced like English s
• gy is a soft consonant, somewhat like the dy in duke in some pronunciations

Yes. Hungarian allows several word orders here, and the basic meaning stays the same, though the emphasis changes.

For example:

• Este nagy buli lesz itt.
• Itt nagy buli lesz este.
• Nagy buli lesz itt este.

All can mean roughly There will be a big party here tonight.

What changes is what sounds most prominent:

• Este... puts tonight/in the evening first
• Itt... puts here first
• Nagy buli... highlights big party

This flexibility is very typical of Hungarian.