Small evolution, to ensure event duplication is not so automatic: contact email is required

app/models/event.rb

@@ -16,7 +16,6 @@ class Event < ActiveRecord::Base
   validates :city, presence: true
   validates :related_region, presence: true
   validates :url, presence: true, format: %r{\Ahttps?:\/\/.*\..*\z}
-  validates :contact, presence: true
   validates :contact, email: true
   validates :submitter, email: true
   validates :tags, presence: true, format: /\A[\p{Alnum}\s-]*\z/

app/views/events/show.html.haml

@@ -40,8 +40,6 @@
         region: @event.region,
         locality: @event.locality,
         url: @event.url,
-        contact: @event.contact,
-        submitter: @event.submitter,
         tags: @event.tags }),
         method: :post do
         %em.fa.fa-copy