ceremony for the 5th Anniversary of XXX.

ceremony　

英 ['ser?m?ni] 　 美 ['ser?mo?ni] 　 　

n. 仪式；礼节；典礼

They hold a mystic religious ceremony.

他们举行了一个神秘的宗教仪式。

近义词

celebration　

英 [?sel?'bre??n] 　 美 [?sel?'bre??n] 　 　

n. 典礼；宗教仪式；庆祝，祝贺

The hotel had a grand celebration for its opening.

该饭店办了一个盛大的开幕典礼。

XXX 五周年庆典翻译为一下这几种：1、Ceremony for the 5th Anniversary of XXX2、5th Anniversary of XXX3、5th Anniversary Ceremony Party of XXX