diff --git a/app/controllers/conferences_controller.rb b/app/controllers/conferences_controller.rb
index e7d196d5..f581e367 100644
--- a/app/controllers/conferences_controller.rb
+++ b/app/controllers/conferences_controller.rb
@@ -27,6 +27,10 @@ class ConferencesController < ApplicationController
       redirect_to admin_conference_splashpage_path(@conference.short_title) && return
     end
 
+    # User messages at the top of the page.
+    @unpaid_tickets = current_user_has_unpaid_tickets?
+    @user_needs_to_register = current_user_needs_to_register?
+
     @image_url = "#{request.protocol}#{request.host}#{@conference.picture}"
 
     if splashpage.include_cfp
@@ -79,4 +83,17 @@ class ConferencesController < ApplicationController
       format.html { head :ok }
     end if request.options?
   end
+
+  def current_user_tickets
+    @current_user_tickets ||= current_user.ticket_purchases.by_conference(@conference)
+  end
+
+  def current_user_needs_to_register?
+    current_user && !@conference.user_registered?(current_user) &&
+      current_user_tickets.where(ticket: @conference.registration_tickets).paid.any?
+  end
+
+  def current_user_has_unpaid_tickets?
+    current_user && current_user_tickets.unpaid.any?
+  end
 end
diff --git a/app/models/conference.rb b/app/models/conference.rb
index c48dcf02..b4b19e2c 100644
--- a/app/models/conference.rb
+++ b/app/models/conference.rb
@@ -30,6 +30,7 @@ class Conference < ApplicationRecord
   has_many :payments, dependent: :destroy
   has_many :supporters, through: :ticket_purchases, source: :user
   has_many :tickets, dependent: :destroy
+  has_many :registration_tickets, -> { for_registration }, class_name: 'Ticket'
   has_many :resources, dependent: :destroy
   has_many :booths, dependent: :destroy
   has_many :confirmed_booths, -> { where(state: 'confirmed') }, class_name: 'Booth'
@@ -111,6 +112,13 @@ class Conference < ApplicationRecord
     user.present? && registrations.where(user_id: user.id).count > 0
   end
 
+  ##
+  # True when there is at least one ticket marked as "registration"
+  # A user must get a registration ticket before registering.
+  def registration_ticket_required?
+    registration_tickets.any?
+  end
+
   ##
   # Delete all EventSchedules that are not in the hours range
   # After the conference has been successfully updated
diff --git a/app/models/registration.rb b/app/models/registration.rb
index 759003fd..0e5a9d44 100644
--- a/app/models/registration.rb
+++ b/app/models/registration.rb
@@ -32,6 +32,8 @@ class Registration < ApplicationRecord
     if: -> { conference.try(:code_of_conduct).present? }
   }
 
+  validate :user_has_registration_ticket, if: -> { conference.registration_ticket_required? }
+
   after_create :set_week, :subscribe_to_conference, :send_registration_mail
 
   ##
@@ -65,4 +67,12 @@ class Registration < ApplicationRecord
       errors.add(:base, 'Registration limit exceeded')
     end
   end
+
+  def user_has_registration_ticket
+    return if TicketPurchase.where(user: user, ticket: conference.registration_tickets).paid.any?
+    errors.add(:base, 'You must purchase a registration ticket before registering')
+    if TicketPurchase.where(user: user, ticket: conference.registration_tickets).unpaid.any?
+      errors.add(:base, 'You currently have a ticket with an unfinished purchase')
+    end
+  end
 end
diff --git a/app/views/conferences/show.html.haml b/app/views/conferences/show.html.haml
index f067fe2d..f498bf97 100644
--- a/app/views/conferences/show.html.haml
+++ b/app/views/conferences/show.html.haml
@@ -16,6 +16,28 @@
 = content_for :title do
   = @conference.title
 
+= content_for :additional_messages do
+  - if @unpaid_tickets
+    .row
+      .col-md-12
+        .alert.alert-dismissable.alert-info.text-center#unpaid-tickets{role: 'alert'}
+          %button.button.close{"data-dismiss" => "alert", "aria-label"=>"close"}
+            &times;
+          %p
+            You have unpaid tickets. Please complete your purchase.
+            = link_to('Purchase Tickets', new_conference_payment_path(@conference), class: 'btn btn-success btn-lg')
+
+
+  - if @user_needs_to_register
+    .row
+    .col-md-12
+      .alert.alert-dismissable.alert-warning.text-center#flash{role: 'alert'}
+        %button.button.close{"data-dismiss" => "alert", 'aria-label': 'close'}
+          &times;
+        %p
+          You still need to complete your registration for #{@conference.title}.
+          = link_to('Complete Registration', new_conference_conference_registration_path(@conference), class: 'btn btn-success btn-lg')
+
 
 #splash
   - if @conference.code_of_conduct.present?
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 86eafac9..df1b9da4 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -30,6 +30,7 @@
       #messages
         .container
           = render 'layouts/messages'
+          = yield :additional_messages
       #content
         = yield