On 5-7 October 2021 we hosted representatives of 5 clusters from Europe (Aqua Valley/France, BalticNet-PlasmaTech/Germany, Nanoprogress/Czech Republic, France Water Team and ZINNAE/Spain), working together in the BLUES project. During three intensive days we visited Institute of Systems Research of Polish Academy of Sciences, Faculty of Geodesy and Cartography of Warsaw University of Technology and ACCELPOINT. There was also time to learn about innovative solutions from our members such as: SEEDiA, SmokeD and SOLHOTAIR. Thanks to the presentation of PARP, our guests got to know the cluster policy in Poland and the possibilities for cooperation and financing cluster activities. The agenda also included training and participation in the Virtual Working Mission, organized within the Green Small Smart Cities project.