As Lorna Mitchell has pointed out, the Call for Participation is open for this year's O'Reilly Open Source Convention - but the deadline is February 3rd!

We want to hear about your winning techniques, favorite life-savers, and the system you’ve made that everyone will be using next year. We’ll have tracks for sessions and tutorials on Linux, PHP, Perl, Python, Ruby, Java, Databases, Desktop Applications, Web Applications, Mobile, Administration, Security, People, Business, and Emerging Topics.

They have a few suggestions to consider when submitting your idea - things like "keep it free of marketing", "Straightforward titles are best" and "Explain why people want to attend". You can submit your idea via their proposal form.