Quick correction so that filtering with region=all will not fail

app/models/event.rb

@@ -63,6 +63,8 @@ class Event < ApplicationRecord
           start_date, start_date.end_of_week.end_of_day
   end)
   scope :region, (lambda do |region|
+    return if region == 'all'
+
     temp = Region.find region
     where region: [temp, temp.regions].flatten
   end)