LinuxTag in Berlin is one of the recurring and very fun events, both on the community and business sides of the Free Software equation. The call for papers is open until the 29th of January. The NLUUG spring conference on systems administration has a call that is open until tomorrow, but tends to be somewhat lenient in the submission deadline. I think it would be cool to have a talk on "Konsole as a sysadmin tool"; I don't think general Free Software talks fit the bill all that well. There will probably be an FSFE stand at the conference, though, to talk about licensing and the importance of Free Software in sysadmin tasks, even if it's not an all-that-obvious fit for the conference theme.
Though the call for papers closed a long time ago, you can still attend CampKDE starting on Friday. This is the North American get-together of KDE developers and users, in San Diego this time around.