refactoring: simplify Event initialization
refactoring: simplify Event initialization

allspiritseve/aasm,pskrz/aasm,luxola/aasm,artofhuman/aasm,Funfun/aasm,oswaldoferreira/aasm,reidmorrison/aasm,yui-knk/aasm,joshsoftware/aasm,intfrr/aasm,HoyaBoya/aasm,ASnow/aasm,awsmsrc/aasm,bilby91/aasm,hspazio/aasm,aasm/aasm,nickpellant/aasm,Aryk/aasm,xieyunzi/aasm