Yes, it's Honolulu, Hawaii. They took part in Hawaii (Honolulu) greatest event, Pan Pacific Festival in Hawaii. They performed 3 japanese song, including Superstar, and Magokoro. (I'm not sure about the other one, I can't find the fancam). A fan shared some photos of them during the event.
Take a look at the rest of the photo below
Fancams of the show (sorry, can't find the full one)
Introduction
[Cut] Superstar (Japanese Version)
[Cut] Magokoro
Photos credit : poppytea @ omonatheydidn't
Video credit : ahishoyupoke @ YouTube
I wish I can meet/ or just see them ^^
And today (100615) is Supernova Sungmo's birthday as well :)