Yahoo have announced their openhack event on May 13th and 14th in Bucharest, Romania.  The event will include a number of talks about Yahoo technologies and an opportunity to use them.

Tickets are free and the event has prizes and lots of other good things on offer.  If you have time I would highly recommend it.

You can find out more information and register for the event at http://openhackeu2011.eventbrite.com/