The Blue Festival in Kuki City is a festival to celebrate the "blue" flowers in the city. In truth, the flowers - lavender and iris - are more purple than blue.
The main site of the festival is the Shobu branch of Kuki City hall where there is a large lavender field. An eleven minute walk northwest of the branch office there is an iris garden on the site of the former Shobu Castle. Approximately 16,000 irises in shades of white, yellow and purple grow on the castle grounds. About a 15 minute walk east of the branch office there is another lavender site, "lavender hill", at Shirasagi park. There is quite a distance between the Shobu Castle iris field and the lavender hill. However, during the period of the festival there are bicycles you can rent for free to go between the three main sites of the festival.
There is no entrance fee, but if you want to pick lavender there is a contributory fee of ¥200. During the Coronavirus there were no food stalls or live performances at the festival, but in a "normal" year there are both.