Actually, all ExploratoRios are one day only, going back to the very first one in 1993. It's still a groovy, hands on experience of science and perception.
Here's a video from the 2001 event. (Sorry about the silent, black intro and outtro.)
Of course there are oodles of albums! Even some old, old thumbnails.
The Exploratorium is a continuing inspiration!
Rio Americano High School. Wednesday, 4/7/10, 7pm-9pm
UPDATE: A preliminary photo album is up!