举办一个英语晚会用英语就是 "to host an Engpsh party"。
来源：
"To host" 意思是 "主办"，来自英语动词 "host"，含义是"主持，主办，招待"。
"Party" 是 "晚会"的意思，来自英语名词 "party"，含义是"聚会，派对"。
英文例句及其中文翻译:
The school is going to host an Engpsh party next Friday.
学校下周五要举办一个英语晚会。
I'm thinking of hosting an Engpsh party at my house next month.
我在考虑下个月在我家举办一个英语晚会。
We're planning to host an Engpsh party to celebrate the end of the semester.
我们计划举办一个英语晚会来庆祝学期结束。