before.js

//as you raise the events to run you should save the number of events in process
Hoist.data('EventMeta').save({_id:correlationid+'_my_event_count', count:numberOfEventsFired})

module.js

//after each event is processed
Hoist.lock('module_count'+correlationid).then(function(){
  Hoist.data('EventMeta').findById(correlationid+'_my_event_count').then(function(eventMeta){
    eventMeta.numberOfEvents --;
    return Hoist.data('EventMeta').save(eventMeta);
  });
}).then(function(eventMeta){
  if(eventMeta.numberOfEvents<1){
  //raise done event;
  }
});