Bombing of Tokyo (10 March 1945)

Kataonami stable (片男波部屋, Kataonami-beya) is a stable of sumo wrestlers, part of the Nishonoseki ichimon or group of stables. It was founded in 1961 by former sekiwake Tamanoumi Daitarō, who branched off from Nishonoseki stable. Former sekiwake Tamanofuji took over the running of the stable upon Tamanoumi's death in 1987. In February 2010 he passed control over to another former sekiwake, Tamakasuga, remaining in the stable under the elder name Tateyama. As of January 2022 it had five active wrestlers.

The Edo-Tokyo Museum (江戸東京博物館, Edo Tōkyō Hakubutsukan) is a historical museum located at 1-4-1 Yokoami, Sumida-Ku, Tokyo in the Ryogoku district. The museum opened in March 1993 to preserve Edo's cultural heritage, and features city models of Edo and Tokyo between 1590 (just prior to the Edo period beginning) and 1964. It was the first museum built dedicated to the history of Tokyo. Some main features of the permanent exhibitions are the life-size replica of the Nihonbashi, which was the bridge leading into Edo; scale models of towns and buildings across the Edo Meiji, and Showa periods; and the Nakamuraza theatre.Designed by Kiyonori Kikutake, the building is 62.2 meters tall and covers 30,000 square meters. The concrete exterior is designed based on a traditional rice storehouse (takayuka-shiki style) and is the same height as the Edo Castle. Kikutake claimed that the building "crystallizes Japanese culture in built form," concerning the structure's traditional references but contemporary execution. There are eight floors, one below ground and seven elevated off the ground by four columns, with an open air plaza at ground level. The first floor has a museum shop, restaurants, and a ticket counter. The primary entrance is on the third floor, reached by a bright red escalator from the plaza. The fifth and sixth floors contain permanent exhibits, with temporary special and feature exhibits on the first and fifth floors. The seventh floor is a library that houses 560,000 texts and cultural items related to Edo and Tokyo.The museum opened thirteen years after the Shitamachi Museum and six years after the Fukagawa Edo Museum, all part of a national trend for building local history museums. The exhibits for all three were primarily designed by Total Media.Formerly owned and operated by the Tokyo Metropolitan Government, the Edo-Tokyo Museum is accented by the Edo-Tokyo Open Air Architectural Museum across the city in Koganei Park. The Edo-Tokyo Museum is now operated by the Tokyo Metropolitan Foundation for History and Culture.

Hakkaku stable (八角部屋, Hakkaku-beya) is a stable of sumo wrestlers, part of the Takasago ichimon or group of stables. It was established in September 1993 by former yokozuna Hokutoumi, who took with him four wrestlers from Kokonoe stable. The stable has so far produced nine sekitori, four of whom have reached the makuuchi division. As of November 2022 it had 28 wrestlers, the largest in professional sumo. Many Hakkaku wrestlers have the kanji 北勝 (pronounced hokuto or hokutō) in their ring name, taken from the former name of their head coach.

Nishikido stable (Japanese: 錦戸部屋, Nishikido-beya) is a stable of sumo wrestlers, one of the Takasago group of stables. It was founded in 2002 by Mitoizumi of the Takasago stable. It was home to the only Kazakh wrestler in professional sumo, Kazafuzan, who competed in the makushita division and retired in September 2014. In 2015, the stable recruited Canadian Brodi Henderson of Victoria who competed as Homarenishiki, but he suddenly left sumo the following year. Several other wrestlers retired at the same time, leaving just five active wrestlers in the stable after July 2016. In 2017, the Mongolian Mitoryū (Turbold Baasansuren) joined as a makushita tsukedashi entrant from Nihon University, and he became the stable's first ever sekitori after the November 2017 tournament. (Another wrestler, Gokushindo, was ranked in jūryō for just one tournament in November 2018.) The retirement of Gokushindo after the May 2022 tournament left Mitoryū as the stable's only active wrestler (jonokuchi ranked Fujiizumi has not competed since September 2021).

The 1894 Tokyo earthquake (明治東京地震, Meiji-Tokyo jishin) occurred in Tokyo, Japan at 14:04 PM on June 20. It affected downtown Tokyo and neighboring Kanagawa prefecture, especially the cities of Kawasaki and Yokohama. The earthquake's epicenter was in Tokyo Bay, with a magnitude of 6.6 on the Richter magnitude scale. The depth of the 1894 earthquake has not been determined, but it is thought to have occurred within the subducting Pacific Plate under the Kantō region. The death toll was 31 killed and 157 injured. The earthquake was mentioned by author Ichiyō Higuchi in her work Mizu-no-ue no nikki, in which she described damage to buildings in Yotsuya, and soil liquefaction in the Mita area of downtown Tokyo. She also commented on an aftershock which occurred at 22:00 that night. The earthquake is also mentioned by author Jun'ichirō Tanizaki in his autobiographical work, Yosho-jidai, in which he described how his family's house collapsed during the earthquake, a traumatic event to which he attributed his lifelong phobia of earthquakes. By 1894, Tokyo and Yokohama had numerous foreign residents, many of whom commented on the earthquake in their writings and diaries. The National Science Museum of Japan in Tokyo has a collection of twenty two photographs of the earthquake in the form of albumen papers, lantern slides and dry plates. A considerable number of photographs were taken just after the event for the use at the former Imperial Earthquake Investigation Committee in its official reports of the 1894 earthquake, but almost all of the original plates have been lost.

Ryōgoku Kokugikan (両国国技館), also known as Ryōgoku Sumo Hall or Kokugikan Arena, is an indoor sporting arena located in the Yokoami neighborhood (bordering to the Ryōgoku neighborhood) of Sumida, one of the 23 wards of Tokyo in Japan, next to the Edo-Tokyo Museum. It is the third building in Tokyo associated with the name kokugikan (including the Kuramae Kokugikan); the current building was opened in 1985 and has a capacity of 11,098 people.It is mainly used for sumo wrestling tournaments (honbasho) and hosts the Hatsu (new year) honbasho in January, the Natsu (summer) honbasho in May, and the Aki (autumn) honbasho in September. It also houses a museum about sumo.The venue is also used for other indoor events, such as boxing, pro wrestling, and music concerts.

Ryōgoku Station (両国駅, Ryōgoku-eki) is a railway station in Yokoami, Sumida, Tokyo, Japan, operated by East Japan Railway Company (JR East) and Tokyo Metropolitan Bureau of Transportation (Toei).

Ryōgoku (両国) is a district in Sumida, Tokyo. It is surrounded by various districts in Sumida, Chūō, and Taitō wards: Yokoami, Midori, Chitose, Higashi Nihonbashi, and Yanagibashi. In 1659, the Ryōgoku Bridge was built, spanning the Sumida River just upstream of its confluence with the Kanda River. Its name, meaning "two provinces," came from its joining Edo (the forerunner of Tokyo in Musashi Province) and Shimōsa Province. The district derived its name from that of the bridge. The Forty-seven rōnin avenged the death of their lord, Asano Naganori, by breaking into the mansion of his enemy, Kira Yoshinaka, in 1703. Part of the mansion has been preserved in a public park in Ryōgoku. Ryōgoku Station in the neighboring Yokoami district was opened in 1904, bringing rail transportation to the area. It is regarded as the heartland of professional sumo. Most training stables or heya are based there. The first Ryōgoku Kokugikan stadium for sumo was completed in 1909. The present one was built in 1985 in the Yokoami district north of Ryōgoku. Three of professional sumo's six annual official tournaments take place there.

Kuramae Kokugikan (蔵前国技館, Kuramae Kokugi-kan) was a building situated in the Kuramae neighborhood of Taitō, Tokyo which was built by the Japan Sumo Association and opened in 1950. The Association needed a permanent venue to hold sumo tournaments as the previous, bomb-damaged, Kokugikan had been taken over by occupying Allied forces after World War II. Since then tournaments had been held in various venues, including the Meiji Shrine and baseball stadiums. Tournaments were held there until September 1984, and in January 1985 the new Ryōgoku Kokugikan was opened. It was also hired out for other sporting events such as professional wrestling. The building was torn down and is now the site of the Tokyo Metropolitan Government Bureau of Sewage.

The Tokitsukaze stable (時津風部屋, Tokitsukaze-beya) is a stable of sumo wrestlers in Japan, one of the Tokitsukaze group of stables. It was founded in 1769 and was dominant during the Taishō period. In its modern form it dates from 1941 when it was established by Futabayama, who was still an active wrestler at the time. It was known as Futabayama Dojo until it was re-named Tokitsukaze stable in November 1945 when Futabayama retired. (The stable has the names of both Futabayama and Tokitsukaze at its entrance.) Upon Futabayama's death in 1968 the former Kagamisato took charge for a short time, but Futabayama's widow wanted Yutakayama Katsuo to take over, which he did upon his retirement in 1969. He in turn passed control of the stable on to his successor Futatsuryū in August 2002. As of January 2022 it had 17 active wrestlers, two of whom are sekitori. The death of 17-year-old junior member Tokitaizan (real name Takashi Saito) in a hazing scandal on June 26, 2007, eventually resulted in the dismissal and six years in prison for Futatsuryū. This compelled Tokitsuumi, a long time top division wrestler from the stable, to retire from active sumo and take over as the new head of the stable.Tokitsuumi was asked by the Japan Sumo Association to retire in February 2021 after twice violating COVID-19 safety protocols. Tokitsukaze stable was taken over by former maegashira Tosayutaka.

Honjo (本所) is the name of a neighborhood in Sumida, Tokyo, and a former ward (本所区 Honjo-ku) in the now-defunct Tokyo City. In 1947, when the 35 wards of Tokyo were reorganized into 23, it was merged with the suburban Mukojima ward to form the modern Sumida ward.

The Michinoku stable (陸奥部屋, Michinoku-beya) is a stable of sumo wrestlers, part of the Tokitsukaze ichimon or group of stables. It was established in 1974 by former maegashira Hoshikabuto, who branched off from Izutsu stable. Former ōzeki Kirishima became the current head coach in December 1997. It absorbed Tatsutagawa stable in November 2000 upon the retirement of the stablemaster there. It lost four top members in April 2011 (Hakuba, Toyozakura, Jūmonji and Kirinowaka), who were forced to retire after being found guilty of match-fixing. The retirement of Ryūhō in 2012 left it with no sekitori until Kiribayama reached the jūryō division in 2019. Kiribayama reached the top makuuchi division in January 2020, the first for the stable since Hakuba in 2008. After the death of Izutsu Oyakata in September 2019, all personnel from Izutsu stable moved to Michinoku on 1 October 2019. This expanded the stable to 15 wrestlers, the most senior of whom was yokozuna Kakuryū, who retired in March 2021. As of January 2022, it had 15 wrestlers.