The organizers of Beamline for Schools (BL4S; https://cern.ch/bl4s) are glad to meet the teams interested in participating in the competition. In this online event you will learn more about DESY and its research. We will give you an interactive introduction to DESY and you will have the opportunity to ask question. To facilitate the participation of people coming from different time zones, we will hold the same session two times, at 9am and at 5pm, CET (Central European Time).