A ver, si te viene bien, podemos quedar en la plaza antes del festival.

Here A ver is a very common conversational expression in Spanish. It does not literally mean to see in this context.

It can mean things like:

• let’s see
• well
• right
• okay, so

In this sentence, it helps introduce a suggestion in a soft, natural way. It makes the sentence sound more conversational and less abrupt.

So A ver, si te viene bien... feels like:

• Well, if it suits you...
• Let’s see, if it works for you...

It is extremely common in spoken Spanish in Spain.

Si te viene bien means something like:

• if it suits you
• if it works for you
• if it’s convenient for you

It is an idiomatic expression. Literally, venir bien is to come well, but that literal meaning is not how you should understand it here.

The full idea is: if this arrangement is good/convenient for you.

It is a very natural way to check someone’s availability or convenience without sounding too direct.

The te means to you.

So:

• te viene bien = it suits you / it works for you
• literally, something like it comes well to you

Spanish often uses indirect object pronouns in expressions like this:

• Me viene bien = It suits me
• Te viene bien = It suits you
• Le viene bien = It suits him/her/you formal

So the te is necessary because the phrase is built around something being convenient for someone.

Because the thing being proposed is the subject, not you.

In si te viene bien, the verb is third person singular because the implied subject is something like:

• esto = this
• quedar en la plaza antes del festival = meeting in the square before the festival

So the idea is:

• If this works for you
• If meeting there before the festival suits you

That is why Spanish uses viene and not vienes.

Yes. Si te va bien is also very common and natural.

Both can mean:

• if it works for you
• if it suits you

In many situations, they are interchangeable.

A few rough notes:

• te viene bien often feels slightly more like is convenient for you
• te va bien is also very common for schedules and arrangements

For example:

• Si te viene bien, quedamos a las seis.
• Si te va bien, quedamos a las seis.

Both sound natural.

Here quedar means:

• to meet
• to arrange to meet
• to meet up

So podemos quedar en la plaza means:

• we can meet in the square
• we can arrange to meet in the square

This is a very important use of quedar in everyday Spanish, especially in Spain.

Be careful: quedar has many meanings depending on context, for example:

• quedar con alguien = to meet someone
• quedar en un sitio = to meet at a place
• quedar = to remain / be left
• quedar bien/mal = to look good/bad / make a good/bad impression

So here it definitely means meet up.

Podemos quedar means we can meet, so it sounds like a gentle suggestion.

It gives the sentence a softer tone:

• Si te viene bien, podemos quedar... = If it works for you, we can meet...

If you said quedamos en la plaza, that can also be natural, but it sounds a bit more direct, like:

• Shall we meet in the square?
• Let’s meet in the square.

So the difference is mostly about tone:

• podemos quedar = softer, more tentative
• quedamos = slightly more direct / more like a proposal already taking shape

Because en la plaza tells you where the meeting will happen.

• quedar en la plaza = to meet in / at the square

If you use a, that usually suggests movement toward a place:

• vamos a la plaza = we’re going to the square

But here the idea is not mainly going to the square. It is meeting there, so en is the natural preposition.

Because del is the contraction of:

• de + el = del

So:

• antes del festival = before the festival

You normally must contract de + el into del.

Compare:

• antes de la fiesta
• antes del festival
• después del concierto

One important exception is when El is part of a proper name:

• de El Escorial
  not del Escorial when the official name is El Escorial

But with el festival, the contraction is required.

Because this si means if.

Spanish distinguishes:

• si = if
• sí = yes

So in this sentence:

• si te viene bien = if it works for you

No accent is needed.

It sounds very natural and polite in everyday spoken Spanish in Spain.

Why it sounds polite:

• A ver softens the opening
• si te viene bien checks the other person’s convenience
• podemos quedar makes it a suggestion, not a demand

So it feels friendly, considerate, and conversational.

It is suitable for:

• friends
• classmates
• coworkers in an informal context

If you wanted to make it more formal, you could change te to le and possibly adjust the rest of the sentence:

• A ver, si le viene bien, podemos quedar en la plaza antes del festival.

Yes, both are possible, but they focus on different things.

• quedar con alguien = to meet someone
• quedar en algún sitio = to meet somewhere

In your sentence, the person is already understood from context, so quedar en la plaza is enough.

For example:

• Podemos quedar en la plaza = We can meet in the square
• Podemos quedar contigo en la plaza = We can meet with you in the square
• He quedado con Ana = I’ve arranged to meet Ana

So the original sentence is perfectly natural because the location is the important detail.

Yes, it sounds very natural in Spain, especially because of quedar used as to meet up. That use is extremely common in Spain.

In other Spanish-speaking countries, people may also understand it, but some might more naturally say things like:

• podemos vernos
• podemos encontrarnos
• nos vemos en la plaza

Also, plaza is fine everywhere, but depending on the place, people might choose a different word if they mean a particular kind of public square.

So overall, the sentence is fully natural Spanish, and especially familiar in Spain.