This year's NLUUG Spring Conference is on Operating Systems -- a "good ole'" topic for an association for professional UNIX administrators, now broadend to include Open Systems and Open Standards. This edition is special because it's in cooperation with the NGN, and it's bigger and broader than other recent NLUUG conferences. You can catch folks from Red Hat, Canonical and OpenSUSE there, as well as plenty of Sun Oracle people. There's also a Windows 8 track. I don't suppose repeating the Kubuntu-is-Windows trick would work there.