commemorate ：keep a great person or event in people‘s memories 纪念（伟人，大事件等）；指（雕像，纪念碑等）作为对某人某事的纪念
We commemorate the founding of our nation with a public holiday。
我们放假一天以庆祝国庆。
This memorial commemorates those who died in the war。
这座纪念碑是纪念战争中的牺牲者的。
celebrate：mark （a happy or important day，event）with festivities and rejoicing 庆祝，祝贺
The winners peal the bells to celebrate victory.
胜利者让钟声齐鸣庆祝胜利。
Christians celebrate the resurrection of Christ from the death.
基督教徒们庆祝耶稣基督的复活。
.We had a tea party to celebrate our headmaster's silver wedding.
我们为庆祝校长的银婚举行了一次茶会。
celebrated（adj）：著名的，驰名的
观众团团围住了这位著名的小提琴演奏家。
Singing and dancing, people celebrated National Day.
人们载歌载舞庆祝国庆。
Since I celebrated my 35th birthday, I have to ask myself not when, but if.
自从我庆祝完我的35岁生日，我不得不问自己，如果不是在这个时候。