Recent systems for event extraction have employed either a pipeline architecture with separate classifiers for trigger and argument labeling (Ji and Grishman, 2008; Gupta and Ji, 2009 ; Patwardhan 1 https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/ english-events-guidelines-v5. 4.3.pdf and Rilof, 2009; Liao and Grishman, 2011; McClosky et al., 2011; Huang and Riloff, 2012; Li et al., 2013a) or a joint inference architecture that performs the two subtasks at the same time to benefit from their inter-dependencies (Riedel and McCallum, 2011a; Riedel and McCallum, 2011b;<cite> Li et al., 2013b</cite>; Venugopal et al., 2014) .