A lot of atheist groups around the country are planning Darwin Day activities, and the lineup for the University of Northern Iowa Freethinkers and Inquirers‘ celebration looks terrific:

They have Joe Nickell (skeptical investigator of the paranormal), Jamila Bey (secular activist), Clint Kelly (biology professor) and Lawrence Krauss (theoretical physicist) speaking at their school, and those are just the keynotes.
What are all of you planning?
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Incidentally, ~GeneticMishap created a publicity poster anyone can use:

To personalize it, just go here.