Nakameguro Cherry Blossom Festival (中目黒桜まつり) is held at the beginning of April and organized by the workers in the Nakameguro Ekimae shopping arcade. The illuminations along the river are one part of this festival, but on the official festival day there is also taiko drumming, school band performances, and various other dancing events to keep visitors entertained.
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.