Edo-Tokyo museum

If you are interested in SAMURAI, you would go to the Edo-Tokyo Museum in Ryogoku, Tokyo.
In there, you could see the diorama which is reproduced past Japan.

The museum is divided into two area.
That is, it is Edo area and the Tokyo area.
In Edo area, you could see the piece of life of SUMURAI.
And in Tokyo area, you could see the Japanese people's life which is after the SAMURAIs disappeared.
Thus, Edo-Tokyo Museum is very important institution to know the life of Japanese people.

Moreover, you could meet sumo wrestlers in Ryogoku.

When Chonmage was disappeared?

"Chonmage" is the hairstyle of Japanese SAMURAI.
Many SAMURAIs tied topknot in Sengoku and Edo era.
And It was called "Chonmage" in Japan.
"Chonmage" disappeared with SAMURAI in Meiji era.(It's probably 1860~70s.)

You can see no "Chonmage" in Japan now except for dramas or anime.
But you can see the hairstyle similar to "Chonmage" even now.
It's the hairstyle of Sumo wrestlers.
That isn't strictly same hairstyle, but it closely resembles at some points.

If you want to meet sumo wrestlers, you should go to Ryogoku in Tokyo.
There is the Ryogoku Kokugikan which is their holy place in there.
I have previously worked there, I have seen them several times.