2 sentences

1. 我们参加了公司的周年庆典。

   wǒ​men cān​jiā le gōng​sī de zhōu​nián qìng​diǎn.

   We attended the company's anniversary celebration.

   Source: Dong Chinese Dictionary

2. 学校举行了建校五十周年庆典。

   xué​xiào jǔ​xíng le jiàn xiào wǔ​shí zhōu​nián qìng​diǎn.

   The school held a celebration for its 50th anniversary.

   Source: Dong Chinese Dictionary