The highlight is the parade of people in a gorgeous costume of Kimono, walk down the street fringed with cherry trees called Ichiyo Yae Sakura. 

 Oiran Festival at Asakusa Kannon-ura Street
浅草観音うら一葉桜まつり

Date:  April 14th(Sat) 2018  10:00-16:00
(If rains, held on 15th of April)
Location: The northern district of Asakusa, Tokyo 

Official website (Japanese): 
http://asakusa-kannonura.jimdo.com/

Google Maps: Asakusa 4-chome
https://goo.gl/maps/T6khCPeSMDy

Getting there
12-min walk from Asakusa Subway Station on the Toei Asakusa Subway Line