Full Moon Party dates for 2015

I was asked to find out so I did
there was such a plethora of misinformation I was a little confused.

The poster above was labelled 2015.
Then here's 2016 (for serious planners).

But then you have to get there...

KohSamuiPhuket.com won this - plane (only Bangkok airways direct from Phuket) or ferry - even with hotel information - do you need a hotel for this?
Is there a sponsor for me to check?