Thanks for your erudite comment.
NoRooz is actually a National holiday, not a religious one.
ALL Iranians (and many non-Iranians), regardless of their religion celebrate it. It is about Spring equinox in the Northern Hemisphere. It is also the basis for the Iranian National calendar (which is solar, not lunar like Arabic/Islamic one) - their official new year calendar starts after the spring equinox in March.
fyi to #25