anniversary

My grandparents are celebrating their fiftieth wedding anniversary this coming weekend.

(Chinese) 我祖父母将在即将到来的周末庆祝他们的金婚（50周年）纪念日。

The university gave all staff members a bonus to mark the school's 100th anniversary.

(Chinese) 大学给全体教职员工发放了奖金，以纪念建校 100 周年。