The 1906 Intercalated Games open in Athens.
The Intercalated Games were a series of Olympic Games that were intended to be held in between the main Olympic Games, effectively making the Olympics an event that occurred every two years instead of every four. They were first held in 1906 in Athens, Greece.
The idea was proposed by Pierre de Coubertin, the founder of the modern Olympic Games, who believed that such a series could help maintain interest in the Olympics during the four-year gap between the traditional Games. The 1906 Intercalated Games were officially sanctioned by the International Olympic Committee (IOC) and were quite successful, featuring a high level of competition and organization. They were even credited with rejuvenating interest in the main Olympic Games, especially after the relatively poorly organized 1900 and 1904 Games.
Despite the initial success, the Intercalated Games did not continue as a tradition. There were plans to hold them every four years in Athens, to highlight the connection with the ancient Olympics, but the idea was ultimately abandoned. The IOC does not officially recognize the 1906 Games as part of the official Olympic history, and they are not included in the count of the Olympiads.