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Does anyone know what the address is it Soundwave Festival in Australia?

Since there are multiple venues...you'd have to decide which one(s) you want to send to, and then contact them to see if they will accept your mail. Most, if not all, have their own websites. If you can't get through to any, then it's a gamble to send. But of course, you are free to do what you wish.



http://soundwavefestival.com/about/faq