mati no maturi de ha, yoru ni hanabi mo agarimasu.

の links two nouns. Here, 町の祭り means the town's festival or the festival in the town.

So:

• 町 = town
• 祭り = festival
• 町の祭り = town festival

If you said 町で祭り, that would sound more like a festival in the town as a full phrase, not a neat noun phrase modifying 祭り.

では is で + は.

• で marks the place where an event happens.
• は marks the topic or adds contrast.

So 町の祭りでは means something like:

• At the town festival, ...
• As for the town festival, ...
• When it comes to the town festival, ...

Using では gives a slight sense of setting the scene or contrasting this festival with something else.

Compare:

• 町の祭りで、夜に花火も上がります。
  = At the town festival, fireworks also go up at night.
  More neutral.

• 町の祭りでは、夜に花火も上がります。
  = At the town festival, fireworks also go up at night.
  More like speaking of the town festival...

Here, に marks the time when something happens.

• 夜に = at night

So 夜に花火も上がります means fireworks also go up at night.

That said, time expressions in Japanese do not always need に. Sometimes 夜は or just 夜 can also appear depending on nuance.

In this sentence, 夜に clearly marks the time of the fireworks.

Because で and に do different jobs.

• に = time, destination, existence target, etc.
• で = place where an action/event happens, means/method, etc.

Here night is a time, not a place, so に is the natural choice.

• 夜に = at night

Using 夜で would not work naturally here.

も means also or too.

So 花火も上がります suggests that fireworks are one of several things that happen at the festival.

It implies something like:

• There are food stalls, dances, and fireworks too
• Or: not only something else, but fireworks as well

If you said 花火が上がります, that would simply state fireworks go up / there are fireworks, without the also nuance.

Because 上がる is an intransitive verb here.

Japanese often describes fireworks as something that goes up:

• 花火が上がる = fireworks go up / fireworks are launched

So the fireworks are the thing that undergoes the action, not a direct object.

That is why you do not use を with 上がる.

If you wanted a transitive version, you could say:

• 花火を打ち上げます = someone launches fireworks

That version focuses more on the people doing it.

Yes, that is exactly the image.

For fireworks, Japanese often uses 上がる, literally to rise / go up. It refers to fireworks being set off into the sky.

So:

• 花火が上がる = fireworks go up / fireworks are launched

This is very natural Japanese.

English often focuses on there are fireworks or fireworks are set off, while Japanese commonly uses the visual idea of going up.

Because Japanese is typically an SOV language: subject-object-verb, and the main verb usually comes at the end of the clause.

This sentence is organized like:

• 町の祭りでは = as for at the town festival
• 夜に = at night
• 花火も = fireworks also
• 上がります = go up / are launched

So the verb naturally comes last.

This is one of the biggest word-order differences from English.

It can be understood as either, depending on context.

Japanese nouns usually do not change form for singular vs. plural.

So 花火 can mean:

• a firework
• fireworks

In this sentence, English would normally translate it as fireworks, because that sounds most natural.

上がります is the polite -ます form of 上がる.

• dictionary form: 上がる
• polite form: 上がります

Japanese often uses the polite form in:

• normal conversation with people you are not very close to
• explanations
• announcements
• textbook example sentences

So this sentence sounds polite and standard.

A casual version would be:

• 町の祭りでは、夜に花火も上がる。

Yes, it could.

• 祭り = festival
• お祭り = festival, with the polite/honorific prefix お

Both are common, but the nuance is a little different:

• 祭り sounds plain and straightforward
• お祭り can sound a little softer, friendlier, or more everyday in some contexts

So 町のお祭りでは、夜に花火も上がります。 would also be natural.

It is mainly for readability and rhythm.

• 町の祭りでは、夜に花火も上がります。

The comma shows a pause after the topic-setting phrase 町の祭りでは.

Japanese punctuation is often flexible, so the sentence could also appear without the comma:

• 町の祭りでは夜に花火も上がります。

Both are fine.

Yes, sometimes, but the nuance changes.

• 夜に focuses on the time when it happens
• 夜は makes nighttime the topic or contrast

Compare:

• 夜に花火も上がります。
  = Fireworks also go up at night.

• 夜は花火も上がります。
  = At night, fireworks also go up. / As for the nighttime part, there are fireworks too.

So 夜に is a straightforward time marker, while 夜は feels more contrastive or topical.

Not necessarily.

夜に tells you when the fireworks happen, but it does not by itself strongly mean only at night.

The sentence simply says that at the town festival, fireworks also go up at night.

If the speaker wanted to strongly stress only at night, Japanese would usually use something more explicit, such as:

• 夜だけ
• 夜にしか

So the original sentence is just giving information, not strongly limiting it.