name the migration more appropriately

db/migrate/20140801080705_add_users_to_events.rb

@@ -0,0 +1,36 @@
+class AddUsersToEvents < ActiveRecord::Migration
+  class TempEvent < ActiveRecord::Base
+    self.table_name = 'events'
+  end
+
+  class TempUser < ActiveRecord::Base
+    self.table_name = 'users'
+  end
+
+  class TempEventUser < ActiveRecord::Base
+    self.table_name = 'event_users'
+    attr_accessible :event_id, :user_id, :event_role
+  end
+
+  def up
+    TempEvent.all.each do |event|
+      if TempEventUser.where(event_id: event).blank?
+        # Create dummy user
+        unless (user = User.find_by(email: 'deleted@localhost.osem'))
+          user = User.new(email: 'deleted@localhost.osem', name: 'User deleted',
+                              biography: 'Data is no longer available for deleted user.',
+                              password: Devise.friendly_token[0, 20])
+          user.skip_confirmation!
+          user.save!
+        end
+
+        TempEventUser.create!(event_id: event.id, user_id: user.id, event_role: 'submitter')
+        TempEventUser.create!(event_id: event.id, user_id: user.id, event_role: 'speaker')
+      end
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration.new('Cannot reverse migration.')
+  end
+end