〜とあって
Given the occasion 〜とあって
Meaning
"Because it is (the special occasion of) ~" — a special situation produces a natural result.
Formation
[noun] / [plain form] + とあって
Notes
Reportorial, the voice of a news story. The cause must be an unusual occasion, and the result is the predictable public reaction to it, so it is not used for the speaker's own affairs.
Examples
連休（れんきゅう）とあって、駅（えき）は混（こ）んでいます。
With it being a long weekend, the station is crowded.
Breakdown
有名（ゆうめい）な歌手（かしゅ）が来（く）るとあって、会場（かいじょう）は満員（まんいん）です。
With a famous singer coming, the venue is packed.
Breakdown
初優勝（はつゆうしょう）とあって、町（まち）の人々（ひとびと）が喜（よろこ）んでいます。
It being their first championship, the people of the town are celebrating.
Breakdown
入場（にゅうじょう）が無料（むりょう）とあって、行列（ぎょうれつ）ができました。
Since admission was free, a queue formed.
Breakdown
珍（めずら）しい展示（てんじ）とあって、多（おお）くの人（ひと）が集（あつ）まりました。
As it was a rare exhibition, many people gathered.
Breakdown
⚠️ Often confused with
〜から
Reason 〜から (because)
Gives a reason or cause — "because ~ / since ~". Subjective and conversational. Comes afte...
〜ので
Reason 〜ので (formal because)
A more formal / softer "because" than から. Used in polite speech, business, and writing....
〜以上（は）
Now that 〜以上は
"Now that ~", "since ~" — given this fact, a duty or resolve follows.
〜だけあって
As you would expect 〜だけあって
"As you would expect of ~", "no wonder, given that ~". Admiring.
〜ことから
Judging from 〜ことから
"From the fact that ~", "judging from ~" — states the evidence a conclusion rests on.
〜につき
Due to / per 〜につき
"Due to ~" in official notices; also "per ~" for rates.
〜ゆえ（に）
Owing to (literary) 〜ゆえ（に）
"Because of ~", "owing to ~" — a stiff, literary statement of cause.
〜ばこそ
It is only because 〜ばこそ
"It is precisely because ~ (and nothing else)" — an emphatic, positive reason.
〜あっての
Made possible only by 〜あっての
"Which exists only thanks to ~", "~ is what makes it possible".
〜手前
With others watching 〜手前
"Since ~ (and with people watching), I have no choice but to ..." — social face forces the...
〜こととて
Seeing that (apologetic) 〜こととて
"Because it is ~ (please excuse it)" — a humble reason offered with an apology.
〜にかこつけて
Under the pretext of 〜にかこつけて
"Using ~ as an excuse", "under the pretext of ~".