Two upcoming (in the fall, that is) conferences of note whose calls for papers are still open.
FSCONS: the Call for Papers is open until June 30th. FSCONS is a tremendously fun conference because it's not just software technology, but Free Culture and other things. That means that there is more scope for learning (well, this is important for me) things outside of software. The compressed earth brick machine made a lasting impression on me last year, for instance.
NLUUG fall conference: the topic this (half) year is Security in all its aspects. You could talk about security from a systems administration perspective (for KDE, for instance, managing trust in a global distributed project with only occasional face-to-face contacts) or programmatically (for KDE again: what to do with Plasmoids and mitigating whatever security risks they might bring). This CfP is open until July 12th.