It is with great pride that we announce that we will be celebrating the 50th edition of the Poznań Linguistic Meeting on 17–20 September 2019. The meeting will be organised by the Faculty of English, Adam Mickiewicz University, Poznań. This jubilee edition will focus on the impact of linguistic research on our cognition and knowledge. We hope that its leitmotif, "Linguistics matters: On the importance of the study of language in the modern world," will encourage participants to submit contributions from any area of linguistics, providing evidence for the discipline's relevance for communication and cognition on both a societal and individual level. Proposals are welcome of workshop sessions around issues and concepts that matter to/in linguistics (e.g., "word order matters," "individual variation matters," "usage matters," etc.). Plenary speakers of past PLMs will be invited to participate in the PLM2020 Grand Debate on the leitmotif of the conference. There will also be other events reflecting the special character of this 50th edition of one of Europe's leading linguistics conferences.