anchor.diff:        self.pass_periods  = []
         self.passes        = []
         self.registration  = {}
  -      self.programevents = []
  +      self.program_events = []
  +      self.important_dates = []
       }
   
       //- SETTER FUNCTIONS
  
positive.code:       return this
      }
      Conference.prototype.addProgramEvent = function addProgramEvent(program_event) {
        this.programevents.push(program_event)
        return this
      }
      Conference.prototype.removeProgramEvent = function removeProgramEvent(program_event_name) {
        spliceFromArray(this.programevents, this.getProgramEvent(program_event_name))
        return this
      }
  
  
negative.code:       return this.passes.find(function (item) { return item.name === pass_name })
      }
      Conference.prototype.getProgramEvent = function getProgramEvent(program_event_name) {
        return this.program_events.find(function (item) { return item.name === program_event_name })
      }
      Conference.prototype.getImportantDate = function getImportantDate(important_date_name) {
        return this.important_dates.find(function (item) { return item.name === important_date_name })
      }
  
      //- MORE PROTO FUNCTIONS
  