欢迎/开幕/闭幕词 (deliver/make) a welcome/opening/closing speech/address/lecture
开/闭/揭幕式 opening/closing/unveiling ceremony
举行烈士纪念碑的揭幕典礼 unveil a monument to the martyrs
为展览会揭幕 inaugurate an exhibition
奠基典礼 foundation laying ceremony
开学典礼 school’s opening ceremony
毕业典礼 graduation ceremony /commencement
开国大典 founding ceremony of a state
婚礼 wedding ceremony
庆典 celebration
答谢宴会 return banquet
晚宴 evening reception/dinner
招待会/宴会 reception
冷餐招待会 buffet reception
联欢/新年/篝火晚会 get-together/spring festival/campfire party
酒会 cocktail party
宣布…开幕 declare…open; declare the commencement of …
宣布…闭幕 declare the closing/conclusion of …
陛下 Your/His/Her Majesty
殿下 Your/His/Her (Royal/Imperial/Serene)Highness
阁下 Your/His/Her Honor/Excellency
贵宾们 distinguished guests
尊敬的主席先生respectable/honorable/respected Mr. President
至此… 之际 on the occasion of
代表… on behalf of …
我愿借此机会… I would like to take this opportunity to …/ I would like to avail myself of this great opportunity to …
我代表中国政府向各位来宾表示热烈欢迎，对会议的召开表示衷心祝贺!
On behalf of the Chinese government, I would like to extend our sincere welcome to all the guests here and to express our warm congratulations on the convening of this session.
最后，祝各位在北京生活愉快，并祝会议圆满成功!
Finally, I wish a full success of the conference and wish you all a pleasant stay here in Beijing
