I've written about this market before; this time I'm shamelessly copying an old post. The photos are new, though. ;)
Every year on 9 and 10 July a Chinese lantern market is held at Sensō-ji. "Chinese lantern" is a plant: scientific name Physalis alkekengi, Japanese name hōzuki. They have translucent orange pods that might remind you of Chinese lanterns, and they were used as a medicine for fever, gout and just about any ailment you can think of.
The temple's precinct is packed with 200 hōzuki vendors selling plants for ¥2000 to ¥2500, and wind chimes (fūrin). This year my visit was brief, because Sensō-ji has become a rather unpleasant experience. Too many tourists. Sigh.