Holiday you don't hear much about

April 21, 2009 4:16:34 AM PDT
It's one unofficial holiday lost in a purple haze.

Yesterday, was April 20th.

And 4/20 is stoner shorthand for smoking a joint.

Four-20 was marked at Oaksterdam University in Oakland, Calif.

It's a trade school for workers in legal medical marijuana clubs.

Oaksterdam president Richard Lee says 4/20 is "like St. Patrick's Day is for drinkers."

But at the University of Colorado, administrators urged students not to take part in any 4/20 events.

The University of California Santa Cruz closed some entrances yesterday to keep outsiders away.

The school also reminded freshmen that "marijuana use is illegal."

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