We present PARTICIPATE, a technology probe exploring how to strengthen the connection between activities taking place at public libraries and their collections, both in the digital realm and in the physical space. Based on ethnographic studies and participatory design activities, we derive three core implications for place- and activity centric library services. These implications led us to design PARTICIPATE in collaboration with library staff from three European countries. The probe is a mean to investigate how place- and activity-centric digital services in the library space can engage participants in co-creating knowledge, and enable libraries to integrate activities with library collections.