ODTUG Kaleidoscope 2006 (link) is happening at the Wardman Park Mariott in Washington DC from June 17-21 next month (June is the next month after May... so that was a bit tautological).
To get a list of all BI presentations you have to see both the "BI Summit" and "BI/DW" options from the dropdown on the page (link to the ODTUG Kaleidoscope 2006 page, and link to the Schedule-at-a-glance PDF).
Some of the Oracle speakers are Keith Laker ("Climb to the OLAP Summit with Oracle Warehouse Builder 10gR2", "Reporting Against the Warehouse Builder Repository", and "Enabling Data Mining to Extend Your OLAP BI Solution"), Martin Gubar ("Rethinking OLAP: Simplicity Meets Power, and Both Win"), Ali el Kortobi ("What Exactly Is an Expert?"), Paul Narth ("An Overview of Oracle Warehouse Builder 10g Release 2 (Paris)", George Lumpkin and Ed Suen ("Business Intelligence Kickoff Keynote") - do not miss this, George Lumpkin ("Data Warehouse Architectures"), Christina Kolotouros ("Oracle Business Intelligence Road Map"), and more...
I shall not be attending (I just got back from a hectic one week trip to the US West and East coast, and the fact that I am up and awake at 2am shows either I work hard, and smart - as I would like to believe - or that I am jetlagged), but I hope some Oracle folks blog about it (Keith... are you listening? :-)
Mark Rittman shall be posting I am sure, as shall Michael Armstrong-Smith too I hope.