Friday, March 21 is the deadline if you want to get the $200 pre-conference price. PyCon will cost $250 at the door, and there is no single-day rate.
http://www.python.org/pycon/reg.html
PyCon DC 2003
The first PyCon will be held 26-28 March, 2003, at George Washington University's Cafritz Conference Center in Washington DC. There will be a development sprint Mon/Tues before the conference.
PyCon is a community-oriented conference targeting developers (both those using Python and those working on the Python project). It gives you opportunities to learn about significant advances in the Python development community, to participate in a programming sprint with some of the leading minds in the Open Source community, and to meet fellow developers from around the world. The organizers have worked hard to ensure that the conference be affordable and accessible to all. We look forward to seeing you there.