During the 3-day festival, various events  are staged on streets in Sawara old town, featuring parading of Dashi floats decorated with giant Samurai dolls, accompanying of traditional festival music "Sawara-bayashi"

Sawara-no Taisai Festival in summer
佐原の大祭 夏祭り

July 14th(Fri) - 16th(Sun) 2017 from 10:00AM to 10:00PM
Location: Sawara in Katorishi (Next to Narita), Chiba Prefecture

Sawara Festival Information by Katori City (Japanese website)
http://www.city.katori.lg.jp/sightseeing/matsuri/

City Guide to Sawara http://www.sawara-cci.or.jp/aruki/english/

 Youtube by Kugenet: https://youtu.be/dIL-Fvl-t0Y

Related Article  on digi-joho TOKYO: Attractions in Sawara and Katori City

Getting there:
From JR Narita Station (Next to Narita International Airport station)
Take a train on the JR Narita-sen Line JR成田線 and get off at Sawara station 佐原駅 (Travel time: Approx.30 mins. A 10-min walk from Sawara station to the old district.