The parameter that can be used to have future *and* past events in the rss feed is renamed to `future`

app/controllers/events_controller.rb

@@ -108,10 +108,10 @@ class EventsController < ApplicationController
   end
 
   def filter_for_rss
-    if(!params.has_key?(:showall))
-      @events.future.order('id desc').limit 20
+    if params[:future].present? && params[:future] == 'false'
+      @events.order 'id desc'
     else
-      @events.order('id desc')
+      @events.future.order('id desc').limit 20
     end
   end