I have been to this annual festival twice before and it is well worth a visit. It's sponsored by the marina, so in the past you got free launch and free mRina berth. It's really enjoyable and very child friendly. We are certainly going this year, and I'm thinking of launching at Pwllheli and sailing over there if anyone is interested in joining me.
Website for the event : http://holyhead.northwalesoga.org/intro ... m?mmskip=1
(advert-laden, I'm afraid)
Here's a video I made after attending the event in 2012: http://youtu.be/lqr6a3_9XmU