Picture a room that is empty, and one person with a list of names who has to fill it. They pick the day, they send the notice, they find the room, and at ten o'clock everyone walks in. That single job, getting scattered people into one place at one time, is what the name is built on. It is not a rank; nobody has to obey a convener. They are simply the person without whom the meeting would not happen.
From the word’s history
The source gives the word as convene plus -er: convene is to call people together, and -er names the person who does it, an ending the source traces back through Middle English to Old English -ere.
來源直接說 convener 是 convene 加 -er 組成的。convene 是「把人召集到一起」，-er 是「做這件事的人」，這個字尾可以一路追到古英語的 -ere。所以這個字的意思幾乎就寫在組成裡，不必另外記。
Wiktionary, "convener"
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