Earth Day Celebration Official Program Guide This article was published on 04.22.04 Saturday April 24, 2004 11am-5pm CSUS A free event ECOS Earth Day 2004 UPDATE The Valley’s Natural Wonders Event schedule pg one Event schedule pg two More Guides » Earth Day ECOS Earth Day 2004 UPDATE Published on 04.22.04 Exploring Sacramento: The Valley’s Natural Wonders. Published on 04.22.04 Earth Day Celebration Official program guide. Published on 04.22.04