“组委会”常见的英文表达是 "organizing committee" ，也可以使用 "organization committee" 。
例如：
The organizing committee is responsible for all the arrangements of the event.（组委会负责活动的所有安排。 ）
The organization committee has been working hard to ensure the success of the conference.（组委会一直在努力确保会议的成功举办。 ）