Aichi — with Nagoya at its heart — is the manufacturing engine of Japan, but its 2026 event calendar is pure summer spectacle and samurai heritage. The prefecture hosts a July Grand Sumo tournament in a brand-new arena, some of the country’s biggest fireworks in its “Mikawa fireworks” heartland, a 600-year-old UNESCO river festival, a procession of the three warlords who unified Japan, and Studio Ghibli’s own theme park. This guide gathers the events worth planning a 2026 trip around, with a month-by-month calendar at the end.
A note on dates: Confirmed 2026 dates are given where announced. Festival and firework dates can shift for weather or organiser decisions, and ticketed events sell out — always confirm on the official website before building a day around one.
Grand Sumo — Nagoya Tournament (July) ⭐
Aichi hosts the July Grand Sumo tournament (Nagoya Basho) — one of only three held outside Tokyo. In 2026 it runs July 12–26 at the IG Arena (Aichi International Arena), the tournament’s striking new home after nearly six decades at Dolphins Arena. Fifteen days of top-division sumo; doors open around 8:45 on most days. Popular days sell out — book through the official channel well ahead. A full honbasho in the heat of a Nagoya summer is one of the region’s signature experiences.
Summer Fireworks (Hanabi) — 2026 Dates
Aichi’s Mikawa region is a historic centre of Japanese pyrotechnics, and its summer displays are among the country’s best.
| Fireworks display | 2026 date | Notes |
|---|---|---|
| Toyohashi Gion Festival (豊橋祇園祭) | July 17–18 | July 17: tezutsu hand-held fireworks at Yoshida Shrine; July 18: ~12,000 shells over the Toyokawa river |
| Okazaki Ieyasu Summer Festival Fireworks (岡崎城下家康公夏まつり花火大会), 78th | August 1 (Sat), 19:00–20:30 | A huge display over the Otogawa/Yahagi rivers, in the birthplace of Tokugawa Ieyasu — a flagship of the Mikawa fireworks tradition |
Tip: The Toyohashi tezutsu (hand-held tube) fireworks are a rare, dramatic sight — performers cradle showering fountains of sparks. The Okazaki display on Aug 1 is one of the Tokai region’s biggest; arrive early or book paid seating.
Traditional Festivals (Matsuri)
Owari Tsushima Tenno Festival (尾張津島天王祭) — July 25–26, 2026 ⭐ UNESCO
A river festival with nearly 600 years of history, inscribed on the UNESCO Intangible Cultural Heritage list. On the Saturday evening, half-dome makiwara boats hung with hundreds of lanterns glide across the Tennogawa pond at Tsushima Shrine; the Sunday brings daytime boats carrying costumed figures. The lantern-lit river scene is one of Japan’s most beautiful summer-festival images. 2026 dates: July 25–26.
Atsuta Festival (熱田まつり) — June 5, 2026
The grandest annual festival of Atsuta Jingu, one of Japan’s most revered shrines (home of the sacred sword). Held on the fixed date of June 5, it features martial-arts demonstrations, makiwara lantern towers lit in the evening, and fireworks — Nagoya’s herald of summer.
Inuyama Festival (犬山祭) — early April 2026 (UNESCO)
A UNESCO-inscribed float festival at Inuyama, beneath Japan’s oldest original castle keep. Three-tiered floats with mechanical karakuri puppets parade by day and glow with hundreds of lanterns by night, amid cherry blossoms. Traditionally held on the first weekend of April — confirm exact 2026 dates.
Nagoya Festival (名古屋まつり) — mid-October 2026
Nagoya’s biggest citizens' festival, best known for the grand procession of the Three Great Warlords — Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu, all with ties to Aichi — in full armour, along with decorated floats and dance troupes. Traditionally held on a mid-October weekend — confirm the exact 2026 dates and programme on the official site.
Ghibli Park (ジブリパーク) — Nagakute, Year-Round + Summer Event
Ghibli Park, built into the Expo 2005 Memorial Park in Nagakute, brings the worlds of Studio Ghibli to life across five areas. It runs seasonal programming through 2026, including a special “Ghibli Park Summer Play” from July 29 to August 11, 2026. Entry is by advance dated ticket only — book well ahead via the official site, as slots sell out. Combine with Legoland Japan and the SCMaglev and Railway Park on Nagoya’s waterfront for a family-focused few days.
Cherry Blossom Season (Spring 2026)
Aichi’s blossoms peak in late March to early April.
- Nagoya Castle — cherries framing the golden shachihoko keep, with evening light-ups
- Yamazaki River (Nagoya) — a long canal lined with cherries, lit at night
- Okazaki Castle Park — one of the Tokai region’s classic hanami spots, timed with the Ieyasu spring festival
- Inuyama — blossoms with the castle and the Inuyama Festival floats
Autumn Leaves — Korankei (香嵐渓) — mid–late Nov 2026
Korankei gorge in Toyota is one of central Japan’s most celebrated autumn destinations — around 4,000 maples turning crimson along the Tomoe River, with evening illuminations during the peak “Momiji Festival” (usually all of November). Extremely popular; go on a weekday and early. Other spots include the Tokugawa Garden and Obara (famous for its rare autumn-blooming shikizakura cherries alongside the maples).
Winter Illuminations & New Year
- Nabana no Sato (Kuwana, just over the Mie border but a Nagoya staple) — one of Japan’s largest and most famous illuminations, running through the winter into 2026
- Nagoya — the Central Park / Oasis 21 and station-area displays
- Hatsumode at Atsuta Jingu — among Japan’s busiest, with over two million New Year visitors
Month-by-Month Calendar (2026)
| Month | Key events |
|---|---|
| January | Hatsumode at Atsuta Jingu; Nabana no Sato illumination |
| February | Setsubun rites; Konomiya “Naked Man” Festival (Inazawa) |
| March | Cherry blossoms begin late month |
| April | Inuyama Festival (early April); cherry blossom peak; Okazaki spring festival |
| May | Fresh-green season; Ghibli Park spring programme |
| June | Atsuta Festival (June 5); rainy season |
| July | Toyohashi Gion Jul 17–18; Grand Sumo Nagoya Jul 12–26; Owari Tsushima Tenno Jul 25–26; Ghibli Park Summer Play from Jul 29 |
| August | Okazaki Fireworks Aug 1; summer festivals |
| September | Early autumn; typhoon season |
| October | Nagoya Festival (mid-Oct); autumn begins |
| November | Korankei autumn leaves & illumination; Tokugawa Garden foliage |
| December | Nabana no Sato & Nagoya illuminations; year-end; New Year prep |
Practical Tips
- Book early for July. The Grand Sumo tournament, the Toyohashi and Tsushima festivals, and Ghibli Park’s summer event all cluster in July — Nagoya hotels fill and prices rise.
- Confirm every date on the official site. Firework and festival dates move for weather; ticketed events (sumo, Ghibli Park, paid firework seating) sell out — Ghibli Park especially requires advance dated tickets.
- Nagoya is a superb hub. Central to the Tokai region, it puts sumo, Ghibli Park, the fireworks towns, and Korankei all within easy reach by train.
- Summer heat. Nagoya is one of Japan’s hottest cities in summer — water, a hat, and a fan are essentials for the sumo queues and fireworks.
- Korankei gets crowded. For the November foliage, go on a weekday and early in the day to beat the crowds and secure parking.
