Allowing registration to be access but not modified after registration is closed

app/views/conferences/_done.html.haml

@@ -45,6 +45,7 @@
 		%tr
 			%th=_'articles.conference_registration.headings.payment'
 			%td=_!('$' + (@amount || 0))
-	= form_tag register_path(@this_conference.slug) do
-		.actions
-			= button_tag :edit_registration, :value => :register
+	- if @conference.registration_open
+		= form_tag register_path(@this_conference.slug) do
+			.actions
+				= button_tag :edit_registration, :value => :register

app/views/workshops/_workshop_previews.html.haml

@@ -1,6 +1,6 @@
 - # encoding: utf-8
 %ul.workshop-previews
-	- workshops.each do |w|
+	- workshops.sort_by{ |w| w.title.downcase }.each do |w|
 		- if w.title
 			%li
 				=link_to view_workshop_path(@this_conference.slug, w.id) do

app/views/workshops/index.html.haml

@@ -8,6 +8,6 @@
 		= columns(medium: 6) do
 			%h3=_'articles.workshops.headings.Your_Workshops'
 			= render 'workshops/workshop_previews', :workshops => @my_workshops
-			= link_to (_'actions.workshops.create','New Workshop'), create_workshop_path(@this_conference.slug), class: [:button, :modify]
+			= link_to (_'actions.workshops.create','New Workshop'), create_workshop_path(@this_conference.slug), class: [:button, :modify] if @conference.registration_open
 	= row do
 		= render 'workshops/workshop_previews', :workshops => @workshops