The Koichi Matsuri takes place on the last Thursday and Friday of July in the SL Plaza and the adjacent Sakurada Park, both located on the west side of Shimbashi station. Events take place from noon each day, but the festival is its most vibrant in the evening when workers pour out of the many offices located in the area and near by Shiodome. There is beer garden on the 4th floor terrace of the New Shimbashi Building (next to SL Plaza), bon dancing from 6pm to 9pm on both nights, as well as a yukata beauty contest from 6:30pm on the Friday in SL Plaza.
Event details are taken from official sources whenever possible. It is always prudent to check the official event website before attending to make sure that there have not been any changes. If you know of an error in the calendar, then please let me know through the contact form.