The amount of data in the world has grown dramatically in recent years and continues to do so. This creates a growing need to use this data effectively, safely, and ethically, and for important purposes, such as: How can you use social media data to detect the emergence of extremist behavior? How can you predict environmental conditions using camera data? As a transdisciplinary field, Applied Data Science can be leveraged to meet societal challenges. Applied Data Science Days is a challenge based networking event, which aim is to connect and collaborate between CHARM-EU partner universities and experts in the field of Applied Data Science.