Sari Negri has been a member of the executive board of the Scandinavian Logic Society since its establishment in 2011. One of the main purposes of the society is to revive the tradition of the Scandinavian Logic Symposia, and Dr Negri co-chaired the organisation of the 9th Scandinavian Logic Symposium, in Tampere, 2014.

Dr Negri has also been actively involved in the two Italian logic societies, the AILA (Italian Association for Logic and its Applications) and the SILFS (Italian Society for Logic and Philosophy of Science). For the AILA she gave an intensive course at the annual logic summer school held in Gargnano and wrote a long survey article on current research trends in proof theory in Italy. Originally meant to be around ten pages long, the article expanded to over 30 pages: so resistant to compression is this rapidly growing field! For the SILFS, her main contribution as a board member has been the organisation of an affiliated meeting on the proof theory of modal and non-classical logic in collaboration with the president of the Society within the Congress of Logic, Methodology and Philosophy of Science; the meeting was held in Helsinki in August 2015.