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Get your cookie. Either proxy your iPhone/iPod/iPad and record the cookie using the proxy server of your choice or capture the request using your AP with Wireshark or similar 
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Make sure you have a cookie like token=expires=1409714101~access=/auth/*~md5=2d4466c1...
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Find the day of the artist you want to load (e.g. 01, 02, 10, 25) Find the artist on iTunes https://itunes.apple.com/us/artist/*deadmau5*/id*78011850* and take its ID and its name. Add an underscore between these two. (e.g. 78011850_deadmau5) 
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Launch the script: sh itunes-festival.sh cookie day id_artistsh itunes-festival.sh "token=expires=1409714101~access=/auth/*~md5=2d4466c1" 01 78011850_deadmau5
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Have fun.