diff --git a/app/models/activity.rb b/app/models/activity.rb
index 6042698a..21c547b7 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -33,7 +33,7 @@ class Activity < ApplicationRecord
   after_save :copy_author_and_group_to_form!
 
   def self.categories
-    %w[algemeen societeit vorming dinsdagkring woensdagkring
+    %w[algemeen societeit vorming kring
        choose ifes ozon disputen kiemgroepen huizen extern eerstejaars curiositates]
   end
 
diff --git a/db/migrate/20241113104056_simplyfing_calender_options.rb b/db/migrate/20241113104056_simplyfing_calender_options.rb
new file mode 100644
index 00000000..50f4ef25
--- /dev/null
+++ b/db/migrate/20241113104056_simplyfing_calender_options.rb
@@ -0,0 +1,17 @@
+class SimplyfingCalenderOptions < ActiveRecord::Migration[7.0]
+  def up
+    Activity.where(category: 'dinsdagkring').find_each do |activity|
+      activity.update(category: 'kring')
+    end
+
+    Activity.where(category: 'woensdagkring').find_each do |activity|
+      activity.update(category: 'kring')
+    end
+  end
+
+  def down
+    Activity.where(category: 'kring').find_each do |activity|
+      activity.update(category: 'dinsdagkring')
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 3c73c96e..c37d2fec 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -9,8 +9,7 @@
 # migrations use external dependencies or application code.
 #
 # It's strongly recommended that you check this file into your version control system.
-
-ActiveRecord::Schema[7.0].define(version: 2024_11_13_091607) do
+ActiveRecord::Schema[7.0].define(version: 2024_11_13_104056) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -474,7 +473,7 @@
     t.index ["author_id"], name: "index_polls_on_author_id"
     t.index ["form_id"], name: "index_polls_on_form_id"
   end
-3
+
   create_table "room_adverts", force: :cascade do |t|
     t.string "house_name", null: false
     t.string "contact", null: false
diff --git a/spec/factories/activities.rb b/spec/factories/activities.rb
index 5b1c464c..cd6ebeb2 100644
--- a/spec/factories/activities.rb
+++ b/spec/factories/activities.rb
@@ -10,7 +10,7 @@
     start_time { Faker::Time.between(from: 1.day.ago, to: Time.zone.today) }
     end_time { Faker::Time.between(from: 1.day.from_now, to: 2.days.from_now) }
     category do
-      %w[algemeen societeit vorming dinsdagkring woensdagkring
+      %w[algemeen societeit vorming kring
          choose ifes ozon disputen kiemgroepen huizen extern eerstejaars curiositates].sample
     end
     publicly_visible { false }
diff --git a/spec/models/activity_spec.rb b/spec/models/activity_spec.rb
index 6a78ce13..e4e387fd 100644
--- a/spec/models/activity_spec.rb
+++ b/spec/models/activity_spec.rb
@@ -179,7 +179,7 @@
     context 'when it is another category' do
       let(:record) do
         build_stubbed(:activity,
-                      category: %w[algemeen sociëteit vorming dinsdagkring woensdagkring
+                      category: %w[algemeen sociëteit vorming kring
                                    disputen kiemgroepen huizen extern curiositates].sample)
       end