式の

…-style; of the ceremony

→ 式
phrase Rare #45,439
…-style; of the ceremony 式 can mean “style” or “ceremony,” depending on context. の links it to the following noun, often showing style or association.
JA: 式の準備はもう終わりました。
EN: The preparations for the ceremony are already finished.

その会社は経営に日本式のやり方を導入した。

The company adopted Japanese management practices.