Hey, how are you??
Well, I don't know very much about Okinawa, but I found this Live Houses, I'm not sure if you can find there what you're looking for:
http://www.wonder-okinawa.jp/018/e/live/index.html
I just know places in Tokyo where you can find good music and punk gigs, like 20,000V, Shinjuku Loft, Antiknock etc etc. By the way, in may there will be 2 awesome shows in Shinjuku Earthdom, if you have the time and money, you should try!!
May 5/GOLDEN WORLD PUNK WEEK IN TOKYO
WORLD BURNS TO DEATH(from USA)
CHARLIE HARPER(UK SUBS)
FORWARD
CROW
PAINTBOX
May 6/GOLDEN WORLD PUNK WEEK IN TOKYO
MUKEKA DI RATO(from BRAZIL)
WORLD BURNS TO DEATH(from USA)
PISSCHRIST(from AUSTRALIA)
NIGHTMARE
FORWARD
VIVISICK
GAUZE
Have a good time in Japan!!!