eventsSchemaUpdated.js

var eventsSchema = new mongoose.Schema({
   name: String,
   date: Date,
   first: {
       points: Number,
       house: {
           type: mongoose.Schema.Types.ObjectId,
           ref: 'House'
       }
   },
   second: {
       points: Number,
       house: {
           type: mongoose.Schema.Types.ObjectId,
           ref: 'House'
       }
   },
   third: {
       points: Number,
       house: {
           type: mongoose.Schema.Types.ObjectId,
           ref: 'House'
       }
   },
   fourth: {
       points: Number,
       house: {
           type: mongoose.Schema.Types.ObjectId,
           ref: 'House'
       }
   }
});