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The Speech Synthesis Workshop or SSW is a satellite workshop to Interspeech. It used to be held every three years, but after 2019 it was decided to organize it every two years due to the fast pace of technological innovations. Typically, there will be a call for bids to organize SSW on the mailing list about 3 years ahead of time, and if there is more than one bid, there will be a voting round to pick the next one.
(Full papers are available on-line at the ISCA Archive, links provided)