〜とあって

Presents a special, noteworthy circumstance as the reason for the natural result that follows, typically a crowd's behaviour or a public reaction. It belongs to written or reportorial style (news articles, essays) and is rarely used for the speaker's own private affairs. The result clause states a fact, so it does not take commands, requests or invitations; compare plain 〜ので, which has no nuance of 'special occasion'.

• 連休とあって、駅は人でいっぱいだ。

  れんきゅうとあって、えきはひとでいっぱいだ。

  Since it's a long weekend, the station is packed with people.

• 有名な歌手が来るとあって、会場は満員になった。

  ゆうめいなかしゅがくるとあって、かいじょうはまんいんになった。

  With a famous singer coming, the venue was filled to capacity.

• 十年ぶりの優勝とあって、町中がお祭り騒ぎだった。

  じゅうねんぶりのゆうしょうとあって、まちじゅうがおまつりさわぎだった。

  As it was their first championship in ten years, the whole town was in festive uproar.