An invitation-only party at an sf convention. Typically a room party held by individuals or groups for their friends or members or a publishers' party aimed at pros. When held for or by pros, such a party may be referred to as the "Secret Pro Party."
Anyone who stumbles across a closed-door party may ask to be admitted, but should take a refusal graciously.
|Closed-Door Pro Party from Fancyclopedia 2 ca. 1959|
|That's what they are when you're on the outside.|
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