Worldcon Site Selection
Worldcon site selection is a complex process involving a long Worldcon bidding process followed by a formal bid filing six months before the vote. Formal bid filing is required to be on the ballot, though write-ins are permitted. Some time after the close of the bid filing and before the convention, the administering Worldcon sends out a ballot and begins accepting mail ballots.
At the convention itself, after a few days of feverish campaigning, at-con balloting ends and a committee comprised of representatives from all the filed bids and the site selection administrator (the manager of the whole site selection process who is appointed by the host Worldcon) goes off and counts the votes using the transferable preferential ballot method. The WSFS Business meeting the following day ratifies the result of site selection or in the event (which has never happened) that there is no winner, selects a winner.