The USGS Open House is this weekend at the Menlo Park Science Center located in near San Francisco, California:
http://openhouse.wr.usgs.gov/
See the List of Exhibits.
I realize that this is an international mail list and that most readers will not be able to attend. If you have a question about a particular project, email me off the list and I will try to relay your question to a USGS person. Note: I am new to GIS.
Cheers,
Chuck