diff --git a/db/migrate/20161011005219_set_minimal_and_maximal_times_for_all_event_types.rb b/db/migrate/20161011005219_set_minimal_and_maximal_times_for_all_event_types.rb
new file mode 100644
index 0000000..5bf1185
--- /dev/null
+++ b/db/migrate/20161011005219_set_minimal_and_maximal_times_for_all_event_types.rb
@@ -0,0 +1,12 @@
+class EventType < ActiveRecord::Base
+end
+
+class SetMinimalAndMaximalTimesForAllEventTypes < ActiveRecord::Migration
+  def up
+    EventType.where(minimum_length: nil).update_all(minimum_length: 0)
+    EventType.where(maximum_length: nil).update_all(maximum_length: 240)
+  end
+
+  def down
+  end
+end
diff --git a/db/migrate/20161011005420_add_descriptions_for_all_events.rb b/db/migrate/20161011005420_add_descriptions_for_all_events.rb
new file mode 100644
index 0000000..a8c018f
--- /dev/null
+++ b/db/migrate/20161011005420_add_descriptions_for_all_events.rb
@@ -0,0 +1,11 @@
+class Event < ActiveRecord::Base
+end
+
+class AddDescriptionsForAllEvents < ActiveRecord::Migration
+  def up
+    Event.where(description: [nil, '']).update_all(description: 'n/a')
+  end
+
+  def down
+  end
+end