Geek Nation Tours is booking now for their Feudal Japan tour that heads out next year.
From the post:
Geek Nation Tours is proud to continue our Signature Battlefield tours with our Samurai and the Battlefields of Sekigahara tour. On October 21st 1600 Tokugawa Ieyasu lead his forces on to the plains of Sekigahara to an eventual victory that would change the course of Japanese history. This battle is one of the most famous of all Samurai battles in Japan’s long history.