California Code, Education Code - EDC § 37222.11

(a) April 21 of each year is designated and set apart as John Muir Day, a day having special significance pursuant to Section 37222.

(b) On John Muir Day, all public schools and educational institutions are encouraged to conduct exercises stressing the importance that an ecologically sound natural environment plays in the quality of life for all of us, and emphasizing John Muir's significant contributions to the fostering of that awareness and the indelible mark he left on the State of California.