diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 883daff1..28ae22c1 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -13,11 +13,8 @@ class ApplicationController < ActionController::Base
   end
 
   def set_filters
-    if params.include? :region
-      session[:region] = params[:region]
-    else
-      params[:region] = session[:region]
-    end
+    return unless params.include? :region
+    session[:region] = params[:region] == 'all' ? nil : params[:region].to_i
   end
 
   protected
diff --git a/app/controllers/events_controller.rb b/app/controllers/events_controller.rb
index dd693b98..d33f01d6 100644
--- a/app/controllers/events_controller.rb
+++ b/app/controllers/events_controller.rb
@@ -26,7 +26,7 @@ class EventsController < ApplicationController
     time = Time.zone.now.change(min: 0) + 1.day
     @event = Event.new start_time: time,
                        end_time: time + 1.hour,
-                       region_id: params[:region]
+                       region_id: session[:region]
   end
 
   # POST /events/preview
diff --git a/app/controllers/orgas_controller.rb b/app/controllers/orgas_controller.rb
index 01e53ed3..990b6570 100644
--- a/app/controllers/orgas_controller.rb
+++ b/app/controllers/orgas_controller.rb
@@ -17,7 +17,7 @@ class OrgasController < ApplicationController
 
   # GET /orgas/new
   def new
-    @orga = Orga.new region_id: params[:region]
+    @orga = Orga.new region_id: session[:region]
   end
 
   # POST /orgas
diff --git a/app/models/event.rb b/app/models/event.rb
index 4ea61e6d..d270061c 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -63,7 +63,11 @@ class Event < ApplicationRecord
     where '? <= end_time and start_time <= ?',
           start_date, start_date.end_of_week.end_of_day
   end)
-  scope :region, ->(region) { where region: region unless region == 'all' }
+  scope :region, (lambda do |region|
+    return if region.nil? || region == 'all'
+    temp = Region.find region
+    where region: [temp, temp.regions].flatten
+  end)
   scope :locality, ->(locality) { where locality: locality }
   scope :tag, ->(tag) { tagged_with tag }
   scope :geo, -> { where 'latitude is not null and longitude is not null' }
diff --git a/app/models/orga.rb b/app/models/orga.rb
index dc13efbf..fe277d1e 100644
--- a/app/models/orga.rb
+++ b/app/models/orga.rb
@@ -32,7 +32,11 @@ class Orga < ApplicationRecord
   scope :period, ->(_year, _week) {}
 
   scope :kind, ->(kind) { where kind: kind }
-  scope :region, ->(region) { where region: region unless region == 'all' }
+  scope :region, (lambda do |region|
+    return if region.nil? || region == 'all'
+    temp = Region.find region
+    where region: [temp, temp.regions].flatten
+  end)
   scope :tag, ->(tag) { tagged_with tag }
   scope :geo, -> { where 'latitude is not null and longitude is not null' }
   scope :active, -> { where active: true }
diff --git a/app/views/events/index.html.haml b/app/views/events/index.html.haml
index 79b62617..aea3c612 100644
--- a/app/views/events/index.html.haml
+++ b/app/views/events/index.html.haml
@@ -39,11 +39,11 @@
   = raw t '.calendar_in',
     map: link_to(t('.map'), maps_path(tag: params[:tag])),
     rss: link_to('RSS', events_path(:rss,
-      tag: params[:tag], region: params[:region])),
+      tag: params[:tag], region: session[:region])),
     webcal: link_to('webcal', events_path(tag: params[:tag],
-      protocol: 'webcal', format: :ics, region: params[:region])),
+      protocol: 'webcal', format: :ics, region: session[:region])),
     ical: link_to('iCal', events_path(:rss,
-      tag: params[:tag], format: :ics, region: params[:region]))
+      tag: params[:tag], format: :ics, region: session[:region]))
 
   \-
 
diff --git a/app/views/events/index.rss.builder b/app/views/events/index.rss.builder
index be3c6591..f2b02f10 100644
--- a/app/views/events/index.rss.builder
+++ b/app/views/events/index.rss.builder
@@ -26,10 +26,7 @@ xml.rdf :RDF,
         'xmlns:georss' => 'http://www.georss.org/georss' do
   xml.channel 'rdf:about' => root_url do
     title = t 'layouts.application.title'
-    if params[:region].present? && params[:region] != 'all'
-      region = Region.find(params[:region]).name
-      title += " [#{region}]"
-    end
+    title += " [#{Region.find(session[:region]).name}]" if session[:region]
     xml.title title
     xml.description t 'layouts.application.subtitle'
     xml.link root_url
diff --git a/app/views/pages/filter.haml b/app/views/pages/filter.haml
index 8666c63d..7fabaeda 100644
--- a/app/views/pages/filter.haml
+++ b/app/views/pages/filter.haml
@@ -21,7 +21,7 @@
     = label_tag :region, t('.region')
     = select_tag :region,
       options_from_collection_for_select(Region.all, :id, :name,
-                                         params[:region]),
+                                         session[:region]),
       include_blank: true
 
   .helper
diff --git a/app/views/regions/_filter_region.haml b/app/views/regions/_filter_region.haml
index 210d8ebf..78c958d2 100644
--- a/app/views/regions/_filter_region.haml
+++ b/app/views/regions/_filter_region.haml
@@ -1,4 +1,4 @@
-%li{ class: params[:region].to_i == filter_region.id ? 'selected' : '' }
+%li{ class: session[:region] == filter_region.id ? 'selected' : '' }
   - if filter_region.url.present?
     = link_to filter_region.url do
       - if filter_region.code.present?
@@ -8,7 +8,7 @@
         %em.fa.fa-external-link
   - else
     = link_to tag: params[:tag],
-      region: params[:region].to_i == filter_region.id ? :all : filter_region,
+      region: session[:region] == filter_region.id ? :all : filter_region,
       start_date: params[:start_date],
       year: params[:year] do
       - if filter_region.code.present?
@@ -16,7 +16,7 @@
       - else
         %em.fa.fa-shield
       = filter_region.name
-      - if params[:region].to_i == filter_region.id
+      - if session[:region] == filter_region.id
         %em.fa.fa-close
       - elsif filter_region.regions.present?
         %small
diff --git a/app/views/versions/index.rss.builder b/app/views/versions/index.rss.builder
index fae64c19..74ca07cb 100644
--- a/app/views/versions/index.rss.builder
+++ b/app/views/versions/index.rss.builder
@@ -2,10 +2,9 @@ require 'differ/format/patch'
 Differ.format = Differ::Format::Patch
 
 def gen_title
-  t 'layouts.application.title' +
-    if params[:region].present?
-      region = Region.find(params[:region]).name
-      " [#{region}]"
+  t('layouts.application.title') +
+    if session[:region].present?
+      " [#{Region.find session[:region]}]"
     else
       ''
     end
diff --git a/test/models/event_test.rb b/test/models/event_test.rb
index 3933c89b..da50bf6a 100644
--- a/test/models/event_test.rb
+++ b/test/models/event_test.rb
@@ -94,6 +94,11 @@ class EventTest < ActiveSupport::TestCase
     assert_match(/start_time <=/, Event.year(2014).where_values[0])
   end
 
+  test 'named scope region' do
+    assert Event.respond_to? :region
+    assert_not_nil Event.region Region.first.id
+  end
+
   test 'geo data reset' do
     # Setup geo data
     @event.latitude = 3