The Ooseto Summer Festival Fireworks, in their 39th year, send about 1,000 shells over the waters off Seto Port in Saikai City's Ooseto district, Nagasaki, on Thursday, August 13, 2026, from 9 to 9:45 p.m., with heavy-caliber shakudama as the showpiece. The festival adds a band stage to the evening; 300 free spaces at the Ooseto General Sports Park come with a planned free shuttle bus.
The festival marks summer in the Ooseto district with a band stage and evening programming before the port-side display begins. From 9 p.m., about 1,000 shells rise from the waters off Seto Port over 45 minutes — the shakudama bursts are the show's signature. The venue is a 1-minute walk from the Kashinoura stop on the Saikai Kotsu bus from Nagasaki Station; free parking for 300 cars sits at the Ooseto General Sports Park grounds with a free shuttle planned. The committee posts updates on its Facebook page.