3 sentences

1. 每逢佳节倍思亲。

   měi féng jiā​jié bèi sī​qīn.

   On every festive occasion, one misses one's loved ones even more.

   Source: Dong Chinese Dictionary

2. 全校师生欢聚一堂，共庆佳节。

   quán xiào shī​shēng huān​jù​yī​táng, gòng qìng jiā​jié.

   All the teachers and students of the school gathered to celebrate the holiday.

   Source: Dong Chinese Dictionary

3. 每当重阳佳节，老华侨便会感怀远方的亲人。

   měi​dāng Chóng​yáng jiā​jié, lǎo Huá​qiáo biàn huì gǎn huái yuǎn​fāng de qīn​rén.

   Every Double Ninth Festival, the old overseas Chinese would fondly remember their relatives far away.

   Source: Dong Chinese Dictionary