With real wind being there on average 1 edition out of three since 2007 (2007, 2010, 2013: super windy, 2008, 2009, 2011, 2012: Not at all), it's quite a gamble to do the trip from here.
Having done the 2010 one (and the 2009, not much to say about this one), it is a crazy event. Makes you feel like you can't windsurf. The start is scary as hell, and the usually flat spot turns a minefield (unless you're in the top 50, I guess....). The wind is strong on the north side (start side), and a good 10kt stronger 10km souther (1st mark). Most likely, by the end of the weekend you'd swearing at least once that you'll never do this again. But as soon as it's over, you can't wait for the next (windy) edition.

It's always happening on the (catholic) Feast of the Ascension, because the Thursday is a public holiday which gives you a 4 day weekend. So if you want to know the dates of the future edition (if they were to happen), just ask the pope:
en.wikipedia.org/wiki/Feast_of_the_Ascension2014?May 29
2015?May 14
2016?May 5
2017?May 25