Here are the links where the dissemination of C4 meeting in Denmark took place:
https://zyciegrojca.pl/index.php/news/item/3465-uczniowie-z-lo-grojec-z-wizyta-w-kopenhadze
http://www.grojec.pl/aktualnosci/634/
http://www.grojec24.net/news-skladowanie-energii,4625.html
http://logrojec.pl/10-aktualnosci/247-skladowanie-energii