La junta será pasado mañana.

Será is the third-person singular future form of ser.

• ser = to be
• será = will be

Since the sentence talks about a future time, Spanish uses the future tense here:

• La junta será pasado mañana. = The meeting will be the day after tomorrow.

In English, we often say will be, and Spanish is doing the same thing here.

Yes, very often you can.

In Spanish, the present tense is commonly used for scheduled future events, just like in English:

• The meeting is the day after tomorrow
• La junta es pasado mañana

So:

• La junta será pasado mañana sounds a bit more explicitly future
• La junta es pasado mañana sounds very natural for a scheduled event

Both are correct. The future form may sound slightly more formal or more clearly predictive, depending on context.

Pasado mañana means the day after tomorrow.

It is a fixed expression:

• mañana = tomorrow
• pasado mañana = the day after tomorrow

You should learn it as a whole phrase rather than translating each word separately every time.

Spanish usually does not use an article with expressions like:

• hoy = today
• mañana = tomorrow
• pasado mañana = the day after tomorrow
• ayer = yesterday

So you say:

• La junta será pasado mañana

not:

• La junta será el pasado mañana

That would sound wrong in standard Spanish.

Junta can mean different things depending on context. Common meanings include:

• a meeting
• a board
• a committee
• an assembly

In this sentence, if the meaning shown to the learner is meeting, then that is the intended meaning here.

A useful point for learners: junta is not always the most neutral everyday word for meeting. Very often, Spanish also uses reunión for meeting.

So depending on context:

• La reunión será pasado mañana is also very common
• La junta será pasado mañana may suggest a more specific type of meeting, board meeting, or committee meeting

Because junta is a feminine noun.

So it takes:

• la junta
• una junta

This is something you simply have to learn with the noun. In Spanish, nouns have grammatical gender, and the article must match.

Spanish normally uses ser when talking about when an event takes place.

So you say:

• La junta será pasado mañana
• La fiesta es el sábado
• La clase es a las ocho

This is one of the standard uses of ser: giving the date, time, or occasion of an event.

Using estar here would sound wrong.

Yes. Spanish word order is fairly flexible.

You can say:

• La junta será pasado mañana
• Pasado mañana será la junta

Both are correct.

The difference is mainly emphasis:

• La junta será pasado mañana focuses first on the meeting
• Pasado mañana será la junta highlights when

English can do something similar:

• The meeting will be the day after tomorrow
• The day after tomorrow is when the meeting will be

It is two words:

• pasado
• mañana

So write:

• pasado mañana

not:

• pasadomañana

Será has a written accent because the stress falls on the last syllable:

• se-RÁ

The accent mark tells you where the stress goes and also helps distinguish it from other forms.

A rough pronunciation guide:

• será ≈ seh-RAH
• junta ≈ HOON-tah in Spain, though the initial j is a harsher sound than English h

The accent in será is important in writing.

No. Normally you do not use a preposition before pasado mañana in this kind of sentence.

Say:

• La junta será pasado mañana

not:

• La junta será en pasado mañana

Spanish often uses time expressions directly, without en, when saying when something happens.

Yes, it is grammatical and understandable in Spain.

That said, in everyday speech, many speakers might more naturally say:

• La junta es pasado mañana
• La reunión es pasado mañana

Also, depending on the situation, reunión may sound more general and more common than junta for meeting.

So the sentence is correct, but the most natural choice can depend on what kind of meeting you mean.