//  ...
    home_calendar: null,
    for_home: '',
    work_calendar: null,
    for_work: '',

    addMe: function() {
        if(this.for_work) {
            this.work_calendar.add(this);
        } else {
            this.home_calendar.add(this);
        }        
    },

    deleteMe: function() {
        if(this.work_calendar) {
            this.work_calendar.remove(this);
        } else {
            this.home_calendar.remove(this);
        }        
    },