The cost of curtailing the 4/20 event in 2013 was reduced by nearly $17,000 compared with costs incurred in 2012, Â鶹ӰԺ administrators announced today. CU-Â鶹ӰԺ spent $107,794 to close the campus to non-affiliates this year, and $124,561 to close the campus on April 20, 2012.