In Aroyo and Welty (2012) the focus of crowdsourcing is not on assessing the ability of the crowd to perform a specific task, i.e., event detection, but on disagreement as a "natural state" suggesting that event semantics are imprecise and varied.
sprugnoli and Lenci (2014) evaluated the ability of the crowd in detecting event nominals in Italian, pointing out the complexity of this task due to the presence of ambiguous patterns of polysemy.