The 2020 Worldcon and 2019 NASFiC Site Selection Ballots are now available here. Members of Worldcon 76 can vote to select the site of the 2020 Worldcon and the 2019 North American Science Fiction Convention (NASFiC). You can vote in advance by mail or e-mail, or in person at Worldcon 76.
In addition to being member of Worldcon 76, to vote on site selection, you must pay an additional Advance Supporting Membership (Voting) fee of $30 for NASFiC and $50 for Worldcon. This money goes to the winning bid no matter which bid wins or how you vote, and is a supporting membership in the winning convention. If you vote in advance by mail, you can pay the fee by check, or you can purchase a "voting token" through the Worldcon 76 web site by credit card. If you vote at the convention, you can pay the fee by cash, check, or credit card. You can also give your ballot to someone else to deliver to the convention (with your payment) for you.