Smart Cities: The Role of Entrepreneurship for Urban Leftover Spaces Topics: Frameworks and Models for Smart City Initiatives; Planning and Design Challenges for Smart Cities; Planning and Design Challenges for Smart Infrastructures; Safety, Security, and Trustworthiness for Smart Cities; Service Innovation and Design to Support Smart Cities In Proceedings of the 11th International Conference on Smart Cities and Green ICT Systems SMARTGREENS - Volume 1, 165-172, 2022