*European Summer School on Learning in Games, Markets, and Online Decision Making* *September 6-10, 2021* *Sapienza Università di Roma, Department of Computer, Control and Management Engineering, Antonio Ruberti* https://sites.google.com/a/diag.uniroma1.it/algadimar/summer-school The school will have a group of prestigious scholars giving tutorials and research seminars. Among them: Nicolò Cesa-Bianchi, José Correa, Michal Feldman, Renato Paes Leme, and Eva Tardos. The presence of all the speakers will be determined by the traveling constraints at the time of the school. Some of the speakers may have to take part in the school online. Partial support for local expenses and travel will be made available for at most 25 international students from COST countries <https://www.cost.eu/who-we-are/members/> by the COST GAMENET project. If you intend to attend the school, please fill out this form <https://docs.google.com/forms/d/1UK6ysgJZuJNEhNkIFSTS--Pr93i-Ij-ZGHZXfWegeSM/edit?ts=60a6bc8f> by June 15, 2021. For further information, please contact leonardi@diag.uniroma1.it. Please spread the word among your graduate students. The organizers Nicola Gatti, Stefano Leonardi, Marco Scarsini