I’ve just read in Neil’s Journal that he will be doing an event after all: a signing in his publisher’s office on Firday, the 21st of September at 6.30. The only little detail missing is if it’s am or pm. It’s 6.30 pm. The address he gave is Kadokawa Shoten, 2-13-3 Fujimi, Chiyoda-ku, Tokyo 102-8177 (角川書店、東京都千代田区富士見２−１３−３)
Now since nothing’s easy to find in Japan, especially if you don’t speak the language I thought I might be of a little assistance.
Here’s a Google map showing the address at number 13. The text 角川書店本社ビル refers to the other building of the same company at number 12.
If you zoom out (twice) you’ll be able to see the closest railway station at the upper center called Iidabashi Station (飯田橋駅). It’s on the JR Chūō Main Line, which starts from the easy-to-find Tokyo Station (東京駅). Chūō Main Line has orange trains. Iidabashi is the fourth stop from Tokyo. You’ll have to change trains at the third stop from Tokyo called Ochanomizu (お茶の水). The platform is the very same, the line’s called Chūō-Sōbu Line, and the trains are yellow or have a yellow stripe on them. The next station will be Iidabashi.
A more stylised map is available from web KADOKAWA, the company’s website, which shows the JR station and several underground stations with the two buildings. 2-13 is the address of the Northern one.