FYI, from http://wikimania2009.wikimedia.org/wiki/Call_for_Participation :

Wikimania is an annual global event devoted to Wikimedia projects around the
globe (including Wikipedia, Wikibooks, Wikisource, Wikinews, Wiktionary,
Wikiversity, Wikiquote, Wikispecies, and Wikimedia Commons). The conference is a
community gathering, giving the editors and users of Wikimedia projects an
opportunity to meet each other, exchange ideas, report on research and projects,
and collaborate on the future of the projects. The conference is open to the
public, and is a chance for educators, researchers, programmers and free culture
activists who are interested in the Wikimedia projects to learn more and share
ideas about the Wikimedia projects.

This year's conference will be held from August 26-28 in Buenos Aires, Argentina
at San Martín Cultural Center (see Wikipedia and official site).

For more information, please visit the official Wikimania 2009 site at
http://wikimania2009.wikimedia.org.

We are accepting submissions for presentations, workshops, panels, posters, open
space discussions, and artistic works related to the Wikimedia projects or free
content topics in general. Please carefully follow the submission guidelines
below.

Call for Participation

Important dates

* Submissions will open on: March 1

* Deadline for submitting workshop, panel, and presentation submissions: April
15

* Deadline for submitting posters, open space discussions, and artistic works:
April 30

* Notification of acceptance of workshops, panels, presentations: May 15

* Notification of acceptance of posters, discussions, and artistic works: May 31

* Conference dates: August 26-28