1. 庆祝
    If you celebrate, you do something enjoyable because of a special occasion or to mark someone's success.

    e.g. I was in a mood to celebrate...
           我很想庆祝一下。
    e.g. Tom celebrated his 24th birthday two days ago.
           汤姆两天前庆祝了他的24岁生日。

2. 成立(…年);庆祝(周年)
    If an organization or country is celebrating an anniversary, it has existed for that length of time and is doing something special because of it.

celebrate

    e.g. The Society is celebrating its tenth anniversary this year.
           这个协会今年将举办成立10周年庆典。

3. 主持(圣餐或弥撒)
    When priests celebrate Holy Communion or Mass, they officially perform the actions and ceremonies that are involved.

    e.g. Pope John Paul celebrated mass today in a city in central Poland.
           教皇保罗二世今天在波兰中部的一个城市主持了弥撒。