Music Festivals in May [2026]: Outdoor Festivals and Events Summary

The 1000-Person ROCK FES held in Gunma Prefecture is a participatory rock festival! It’s an event where they recruit people to perform together on the day and have a session with 1,000 participants. The sense of freedom of playing outdoors with such a large group must be truly special. It’s the kind of fun event that seems obvious but is surprisingly rare! Each year, set pieces are announced, and anyone who applies can join the performance, so if you’ve ever wanted to play music with a big crowd, be sure to sign up!

GREEN FLASH Fes is held at a resort facility in Fukui Prefecture, set against the backdrop of the sea. A “green flash” is the moment when a green light appears as the sun sinks into the ocean, and legend has it that seeing it brings good luck. With your favorite music as the soundtrack, it’s an event where participants can spend their time freely—lying on the grass while gazing at the vast sky and ocean, or enjoying delicious food. There’s also a fully equipped campground nearby, so how about adding it to your travel plans?

This is a music event that began after comedian Egashira 2:50 planned and announced it on his official YouTube channel. Egashira is active in many fields, but this time he’s taking on a surprising new challenge: organizing a music festival himself and even negotiating the casting directly. No one can predict what it will be like, so it would be a shame not to take part. You also won’t want to miss the lineup announcement to see which artists will gather.

This festival is being held with the organizer ADAM at’s desire to spread instrumental music further and to let more people know about Hamamatsu, the “city of instruments” that thrives on the musical instrument industry. It will take place as a tour in Tokyo, Osaka, and Shizuoka. Since the lineup features different artists in each city, traveling along as a way to discover new acts can be part of the fun. Instrumental-only festivals are rare, so if you’re in the Kansai area, why not take this opportunity to visit the Osaka venue first?

This festival is being held out of the organizer ADAM at’s desire to spread instrumental music further and to let more people know about Hamamatsu, the “city of instruments” that thrives on the musical instrument industry. An instrumental music festival is pretty rare, isn’t it? Why not take this opportunity to check it out?