OK, here are some links for further information on The Showdown!!
http://www.theshowdown.com.au/formula-windsurfers-promise-lots-actionwww.theshowdown.com.au/enter-otbI have just entered!! Cost was $35. Before you enter, you must be a member of Windsurfing Tasmania (for insurance purposes). When you enter, you must put WT down as your club and put "NA" when it asks for your Yachting Australia Membership.
You will also need a lifejacket to wear on the day (compulsory). I have two spare lifejackets, so if anyone wants to borrow one from me, let me know. They are both good for windsurfing in (ie don't get in the way of your harness hook).
This will be a great event and good fun, so don't let the entry fee and lifejacket put you off, these are fairly standard requirements for fully organised events!!!