Helsinki was the popular name of the 75th Worldcon, officially called "Worldcon 75" and held August 9–13, 2017, at the Helsinki Exhibition and Convention Centre in Helsinki, Finland. The GoHs were John-Henri Holmberg, Nalo Hopkinson, Johanna Sinisalo, Claire Wendling (did not attend due to illness), Walter Jon Williams, and Science Guest Ian Stewart.
It conducted the 2019 Worldcon Site Selection.
A late surge in membership caused overcrowding problems in the programme rooms on the first day, forcing the committee to close membership sales for subsequent days, the first time this has happened for a Worldcon. Some extra programme space was made available later in the con, but the queues snaking round and round the conference space remained for the whole event, and most items continued to be turn people away.
Final membership count was 7,060 attending, 3,374 other participants, 110 exhibitors, 7 helpers, a total of 10,434. This is the second highest attending (after L.A.con II) and third highest overall (after Sasquan and Loncon 3).
The guerrilla newsletter was called OffPiste, see file below.
Progress Report 6 (available below) was produced after the convention, and is full of con reports and links to 3rd party reports.
- Worldcon 75 Helsinki publications and photos on fanac.org
- Hugo In Memoriam Scroll 2017
- Susan Stepney conrep
- Cora Buhlert's Con Report
- 30 videos of programme items
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