4/20 is, according to Wikipedia, a secular holiday in America - it's not, it's just a day when people who haven't quite got over being pleased with themselves at smoking dope gather to be pleased with themselves in public. It's pretending to be part of a counterculture from firmly within mainstream culture.
To mark the day, Colorado University in Boulder booked Wyclef Jean to do a gig. Although the stressed that he wasn't to mark the day:
From item twelve in the contract ("The Agency Shall" section):It's like booking Perry Como to do a Christmas Eve set and making him sign a waiver barring him from mentioning Holidays, Jesus or gifts.
"The Agency shall ensure that Attraction avoids making direct referrences to marijuana and other illegal drugs or make 4/20 related remarks as this is a University sponsored event."
So, how did it go, then? Not well, as Jean played to a mostly empty room.
Westword was speculating there were 400 people in the 11,000-capacity venue; even if that number doubled as the evening went on, with Jean getting a flat-fee of $80,000 for the event, that'd make it a $100-a-head event.
Moral: probably don't bother holding a big event on a day when everyone is getting out their faces. They should probably have spent the fee they gave Jean on Curly-Wurlys and crisps.