You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20100731194524_add_event_shit.rb
    path of file: ./repos/Autolab/db/migrate
    
    the code of the file until where you have to start completion: class AddEvent
    
  def self.up
    create_table :event_schemas do |t|  
      t.references :category
      t.references :course
      t.string :title, :null=>false
      t.boolean :monday, :default=>false
      t.boolean :tuesday, :default=>false
      t.boolean :wednesday, :default=>false
      t.boolean :thursday, :default=>false
      t.boolean :friday, :default=>false
      t.boolean :saturday, :default=>false
      t.boolean :sunday, :default=>false
    end
  
    create_table :event_specifications do |t|
      t.references :event_schema
      t.references :instructor
      t.time :start_time, :null=>false
      t.time :end_time, :null=>false
      t.string :location, :null=>false
      t.string :title, :default=>""
    end
  
    create_table :event_exceptions do |t|
      t.references :event_specification 
      t.string :action, :null=>false
      t.references :instructor
      t.timestamp :start_time, :null=>false
      t.timestamp :end_time
      t.string :location
      t.string :title
    end

    create_table :event_information do |t|
      t.references :event_schema, :null=>false
      t.date :date, :null=>false
      t.references :acting_instructor
      t.text :description
      t.string :title
    end

    add_column :courses, :start_date, :date
    add_column :courses, :end_date, :date
  end