I did some digging and this is actually pretty interesting. A great example of iconography cobbled together to give an impression (albeit a poorly-researched one) of a glorious past.

It took me a while to figure out what the hell was going on with the cuneiform on the reverse; that on the obverse (next to the heads of Saddam Hussein and Nebuchadnezzar II) is clearly not actually cuneiform but something made to resemble it. On the reverse, the characters kind of look genuine but they don't make much sense. The star-shaped character is AN 'sky, heaven' or DINGIR 'god', and is often used as a determinative to show that a name is divine. On a coin like this - which you'd never find in 6th century BCE Mesopotamia - you'd expect a name to follow but, surprise, it doesn't. The other characters are close to actual ones (BA [or ARAD] and KU could be the next characters going clockwise) but as far as I can tell these variants aren't attested. The British Museum database entry for another such coin confirms that the writing isn't actual cuneiform.

What's interesting (and consolidates the earlier point about general appearance being more important than actual content) is that AN here is written in its Sumerian form, while the other characters are written in Neo-Assyrian cuneiform. The harpist, meanwhile, is from a popular motif that was widespread from the 2nd millennium onwards, so probably Old Babylonian or thereabouts.

I'm afraid I can't really help out with the festival itself beyond its website.