Unofficial pot holiday draws 10,000 to Boulder, Colo.

FILE - In this April 20, 2009 file photo Garrett Kramer smokes marijuana during the 420 event on Norlin Quad at the University of Colorado in Boulder, Colo. The University of Colorado is closing its campus to outsiders on Friday and closing the Norlin Quad to prevent a 420 gathering. For years, the term "420" was a kind of code. But the term, and the holiday, have become more mainstream as more attention has been focused on marijuana issues. (AP Photo/The Daily Camera, Mark Leffingwell, File)