I'm wondering why we use で with 休暇 and why it can't be に like in 夏休みに.

Update: In the sentence,「私たちは **休暇で** ここに来ました。海辺のホテルに泊まっていました。」, I wondered
why they used で instead of に.
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question
particles particle-に particle-で
Why is it 休暇で and not 休暇に?
I see no evidence for what you suggest. Do you have the full sentence that you
are referencing?

[See here for example using
に](https://ejje.weblio.jp/content/%E4%BC%91%E6%9A%87%E3%81%AB%E5%85%A5%E3%82%8B)

Edit: As I was getting downvotes, I've decided to copy/paste my answer here.

休暇で means 'for break/for vacation', rather than 'during (on) break/during (on)
vacation'. 私たちは休暇に入りました would be 'We went on vacation.'. This would be the
same structure as in the example link I posted 休暇に入る, to enter a vacation
period. As I haven't studied the language in a while (just used it daily), I
can't explain the difference well grammatically. Go to ejje.weblio.jp/sentence
and type in 休暇で and 休暇に and it will give you many example sentences. Learning
by real usage is usually the best way to get it to click.

That being said, 休暇中に might be easier to use for 'during the break'.
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> 私たちは休暇 **で** ここに来ました。  
>  私たちは休暇 **に** ここに来ました。

In fact, both can be correct Japanese, if the context allows. But I guess, in
most cases, what you want to say is the former one.

> 私たちは休暇でここに来ました。海辺のホテルに泊まっていました。

  * "We've been here for vacation. We've been staying at a hotel by the sea."
  * "We were here for vacation. We were staying at a hotel by the sea."

It will be ungrammatical if you interpret this で as a time/space marker,
because 休暇 is neither a place nor a one-time event. Instead, it should be
understood as reason or means. Therefore 休暇で means "because of vacation" or
"making use of vacation", which you'd put in English _for/on vacation_.

> 私たちは休暇にここに来ました。海辺のホテルに泊まっていました。

  * "We were here during a vacation. We were staying at a hotel by the sea."

One possible interpretation of に here is "at", in other words, a certain point
in time or space. Then the sentence consequently can be only a remark about a
past thing (Japanese -た itself could be either past or perfect), because it is
not possible to conceptualize an event you are still involved in as a timeless
point.

* * *

  * "We've been here in order to have a vacation. We've been staying at a hotel by the sea."
  * "We were here in order to have a vacation. We were staying at a hotel by the sea."

There is another possibility, that the に means objective. This will just sound
as much as the English sentences, so... may be usable under some situations,
for example, when they're asked about the purpose of their trip, or when they
have little choice but to come here if they want to take a vacation etc.
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