Hands-on particle physics, an overview of the masterclass efforts

International Masterclasses is a program that enables high school students worldwide to experience particle physics data analysis up close. We explore what masterclasses are, how they work, and their reach. We also look at the masterclass measurements for the four major LHC detector experiments as well as other masterclasses and masterclass-related opportunities. Finally, we take a look at how a masterclass is done with a very short, very simplified LHC dimuon demonstration measurement. This work is presented on behalf of the International Particle Physics Outreach Group.