2 sentences

1. 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

2. 为了庆祝店庆，全场商品八折优惠。

   wèi​le qìng​zhù diàn qìng, quán​chǎng shāng​pǐn bā zhé yōu​huì.

   To celebrate the store's anniversary, all items are 20% off.

   Source: Dong Chinese Dictionary