Dear all, this is an announcement of a workshop to be held in Nice (France) from January 8 to January 12, 2018, on the theme "Categorical Logic, Toposes and Dualities". Those interested in attending, please contact Mai Gehrke (mgehrke@unice.fr). The website of the workshop is located at http://www-math.unice.fr/~patras/CatLogTop/index.html All the best, Clemens. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]