diff --git a/app/models/discourse_post_event/event.rb b/app/models/discourse_post_event/event.rb
index f7d14fed..2148b45c 100644
--- a/app/models/discourse_post_event/event.rb
+++ b/app/models/discourse_post_event/event.rb
@@ -392,12 +392,15 @@ module DiscoursePostEvent
         recurrence = "FREQ=DAILY;BYDAY=MO,TU,WE,TH,FR"
       when "every_two_weeks"
         recurrence = "FREQ=WEEKLY;INTERVAL=2;"
+      when "every_four_weeks"
+        recurrence = "FREQ=WEEKLY;INTERVAL=4;"
       else
         byday = localized_start.strftime("%A").upcase[0, 2]
         recurrence = "FREQ=WEEKLY;BYDAY=#{byday}"
       end
 
       next_starts_at = RRuleGenerator.generate(recurrence, localized_start, tzid: self.timezone)
+
       difference = original_ends_at - original_starts_at
       next_ends_at = next_starts_at + difference.seconds
 
diff --git a/assets/javascripts/discourse/controllers/discourse-post-event-builder.js b/assets/javascripts/discourse/controllers/discourse-post-event-builder.js
index 9235a4ac..8a44c23d 100644
--- a/assets/javascripts/discourse/controllers/discourse-post-event-builder.js
+++ b/assets/javascripts/discourse/controllers/discourse-post-event-builder.js
@@ -109,6 +109,12 @@ export default Controller.extend(ModalFunctionality, {
           "discourse_post_event.builder_modal.recurrence.every_two_weeks"
         ),
       },
+      {
+        id: "every_four_weeks",
+        name: I18n.t(
+          "discourse_post_event.builder_modal.recurrence.every_four_weeks"
+        ),
+      },
     ]);
   },
 
diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 212f775c..a683a067 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -413,6 +413,7 @@ en:
           every_weekday: "Every weekday"
           every_week: "Every week at this weekday"
           every_two_weeks: "Every two weeks at this weekday"
+          every_four_weeks: "Every four weeks at this weekday"
         minimal:
           label: "Minimal event"
           checkbox_label: "Hide Going/Not going buttons and invitees status"
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index bac70cec..4ee9ff58 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -83,7 +83,7 @@ en:
           ends_at_before_starts_at: "An event can't end before it starts."
           start_must_be_present_and_a_valid_date: "An event requires a valid start date."
           end_must_be_a_valid_date: "End date must be a valid date."
-          invalid_recurrence: "Recurrence must be one of: every_month, every_week, every_two_weeks, every_day, every_weekday."
+          invalid_recurrence: "Recurrence must be one of: every_month, every_week, every_two_weeks, every_four_weeks, every_day, every_weekday."
           invalid_timezone: "Timezone not recognized."
           acting_user_not_allowed_to_create_event: "Current user is not allowed to create events."
           acting_user_not_allowed_to_act_on_this_event: "Current user is not allowed to act on this event."
diff --git a/lib/discourse_post_event/event_validator.rb b/lib/discourse_post_event/event_validator.rb
index ebb03a66..233334d4 100644
--- a/lib/discourse_post_event/event_validator.rb
+++ b/lib/discourse_post_event/event_validator.rb
@@ -2,7 +2,14 @@
 
 module DiscoursePostEvent
   class EventValidator
-    VALID_RECURRENCES = %w[every_month every_week every_two_weeks every_day every_weekday]
+    VALID_RECURRENCES = %w[
+      every_month
+      every_week
+      every_two_weeks
+      every_four_weeks
+      every_day
+      every_weekday
+    ]
 
     def initialize(post)
       @post = post
diff --git a/lib/discourse_post_event/rrule_generator.rb b/lib/discourse_post_event/rrule_generator.rb
index 2be14f2f..064716c5 100644
--- a/lib/discourse_post_event/rrule_generator.rb
+++ b/lib/discourse_post_event/rrule_generator.rb
@@ -3,7 +3,9 @@
 require "rrule"
 
 class RRuleGenerator
-  def self.generate(base_rrule, starts_at, tzid: "UTC")
+  def self.generate(base_rrule, starts_at, tzid: nil)
+    tzid ||= "UTC"
+
     rrule = generate_hash(base_rrule)
     rrule = set_mandatory_options(rrule, starts_at)
 
diff --git a/spec/integration/recurrence_spec.rb b/spec/integration/recurrence_spec.rb
index f6aae2c5..d2e0df06 100644
--- a/spec/integration/recurrence_spec.rb
+++ b/spec/integration/recurrence_spec.rb
@@ -70,6 +70,16 @@ describe "discourse_post_event_recurrence" do
     end
   end
 
+  describe "every_four_weeks" do
+    before { post_event_1.update!(recurrence: "every_four_weeks") }
+
+    it "sets in four weeks at the same weekday" do
+      post_event_1.set_next_date
+
+      expect(post_event_1.starts_at).to eq_time(Time.zone.parse("2020-10-08 19:00"))
+    end
+  end
+
   describe "every_day" do
     before { post_event_1.update!(recurrence: "every_day") }