Beamline for Schools is a physics competition for high-school students from all around the world inviting them to propose an experiment that they want to perform at a particle accelerator. The popular competition celebrates its 10th anniversary in 2024. Three winning teams will be selected, two of which will perform their experiments at CERN and one at DESY. There will be additional prizes for up to 40 selected teams (prizes: https://cern.ch/bl4s/bl4s-competition/prizes). All teams who preregister to the competition will have the possibility to follow several online events (preregistration: https://cern.ch/bl4s/form/preregistration-2024). In these online events, the teams will learn more about Beamline for Schools and how to prepare their experiment proposal. Preregistered teams will also be invited to virtual visits to CERN and DESY. The deadline to submit a proposal is 10 April 2024 at 23:59 CEST. Further information can be found on our website (https://cern.ch/bl4s)and in the official invitation letter (https://cern.ch/bl4s/sites/default/files/Invitation_BL4S_2024.pdf).