For the many of the participants — like Mr. Furutani and Mr. Kaji, who had relatives in the camps — the event was deeply personal, an opportunity to reflect on history and baseball.

Maki Kaji, pictured here in 2007, is credited as popularising the Sudoku puzzle game Maki Kaji, the Japanese man known as the "Godfather of Sudoku", has died at the age of 69. Kaji gave the number ...