From the event writeup:
Oracle OpenWorld is the most important educational conference for Oracle business and technology users and partners. This year’s event is your chance to hear, first-hand, Oracle’s strategy and roadmap from the experts who are engineering the products.
JavaOne is the world’s most comprehensive and furthest-reaching conference for Java developers. The conference brings together Java experts and enthusiasts for an extraordinary week of learning and networking focused entirely on all things Java.
Information and registration for Oracle OpenWorld here.
Information and registration for Java One here.