Details regarding the next session of the Dutch Social Choice Colloquium will get posted here once they are clear. We hope to organise a session around March 2020 in Rotterdam.
You may also be interested in the Conference in Honour of Hans Peters on Social Choice, Game Theory, and Applications to be held in Maastricht on 30-31 January 2020. Please register through the website. Registration is free but required for catering purposes and will close on the 3rd of January.