Akihabara is the largest electronics district in the world. The Japanese often refer to in its nickname - Akiba. The area is packed with shops selling electronics, PCs, video games and gadgets.
See more on which shops have english speaking stuff -
www.tokyo-top-guide.com/Akihabara.html
Sumo is the national sport in Japan. professional competitors weighing an average of 160 kg, and up to 250 kg !
Rules of Sumo are simple compared to western-style wrestling.
The professional sumo tournaments take place In January, May and September. More on how to buy tickets and reserve seats at -
www.tokyo-top-guide.com/Japan_Sports.html
Sumo tournaments take place at Ryogoku Kokugikan in Tokyo.
www.tokyo-top-guide.com