Tachi Neputa takes place about the same time as Nebuta, in Goshogawara, from August 4th-8th. Like Nebuta Matsuri, Tachi Neputa Matsuri is a night festival where extremely large floats are carried around in a parade like fashion. The difference is in the “tachi” which actually means “standing” in Japanese. So instead of large, wide floats like at Nebuta, here you can see really tall ones. The floats can be as big as about 70 feet (22 meters) and weigh around 15 tons!
Nebuta Matsuri is a lot more famous, but I actually prefer Tachi Neputa.