The documentary First of May explores the more than a century-long evolution of the celebration and the meaning of this day. The structure is composed of memories, newspaper excerpts, testimonies found in archives, etc. - all these passages are brought to life by the actors' voices, taking on the roles of journalists, factory workers, policemen, workers and ordinary people who watch May Day, sometimes with interest and verve, sometimes with distance or irony.

Autumn 1968, the Australian running record holder Ron Clarke is coming to Prague, hoping that his old friend and role model, Emil Zátopek, the most famous Czech athlete of all time, will help him overcome the biggest crisis of his career.

Lenka is a high-earning manager in the global finance sector. She lives for her work and is on the verge of achieving success in her life: if she manages to close a deal with a Turkish company, she will become the director of the company for the whole of Asia. However, because of her work, she neglects her loved ones—her husband Jiří, a university professor, and her teenage son Patrik, who is currently experiencing his first relationship. A foolish bet with her son that she can skate more than 100 meters on roller skates proves fatal – she wins the bet, but immediately breaks both her wrists.