A person who is convened or summoned to assemble; someone attending a convention or convening (rare legal/formal term).
From 'convene' with the agent suffix '-ee,' indicating someone who receives or experiences the action of being convened, similar to 'employee' or 'assignee.'
This legal term is wonderfully specific—while 'convener' is the person doing the summoning, 'convenee' is the person answering the call, creating a neat linguistic pair of active and passive participants!
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