One of the more elaborate and imaginative schemes devised to encourage pre-support for Worldcon bids was the stickers done by LA for the 1996 bid and the follow-ups (trading cards by Chicon 2000 and merit badges by La in 2006.)
The exhibit would consist of a compete set of each of the three items along with explanations and, maybe, some spare stickers/cards/badges as souveniers.
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