From 4 to 7 of September 2019 in Bern (Switzerland), the 25th Annual Meeting of the European Association of Archaeologists took place. Members of the project prepared for this meeting one oral presentation: ”FISH AND TOOLS OF MESOLITHIC SOCIETIES IN POLAND” (authors Grzegorz Osipowicz, Daniel Makowiecki, Justyna Orłowska and Mirosława Zabilska-Kunek) and one poster: “RESULT OF CARRYING OR PUTTING INTO A SHEATH? NEW DATA CONCERNING TRACES RESULTING FROM TRANSPORTATION, HAFTING AND SECURING OF FLINTS” (authors Grzegorz Osipowicz and Justyna Orłowska).