A convocation is a meeting or ceremony attended by a large number of people.
例句
...a convocation of the American Youth Congress.美國青年代表大會的會議
英漢詞典釋義
n.
召集
They regretted agreeing to the convocation of that meeting.他們后悔同意召開這個會議。We declared ourselves for the immediate convocation of the meeting.我們主張立即召開這個會議。