Avicii-Dozens of Fans Hospitalized at Boston Show

A slew of electronic dance music fans attending an Avicii concert in Boston were hospitalized tonight after getting heavily intoxicated to the point of needing medical attention stat. 
According to the Boston Herald ... emergency workers transported 22 people ... with a dozen more under evaluation after the Swedish DJ performed at the TD Bank Garden in Boston.  
It's unclear what exactly caused all the fans to get so sick ... but emergency workers say 38 people ... many of the minors ... may have consumed a dangerous substance.
Sources close to Avicii tell TMZ ... the DJ is unaware of all the sick fans ... and is waiting to find out what happened.