Remove unused events

app/helpers/events_helper.rb

@@ -89,12 +89,6 @@ module EventsHelper
         "#{event_card_title(card)} was closed as “Not Now” due to inactivity"
       when "card_resumed"
         "#{event_creator_name(event)} resumed #{event_card_title(card)}"
-      when "card_due_date_added"
-        "#{event_creator_name(event)} set the date to #{event_due_date(event)} on #{event_card_title(card)}"
-      when "card_due_date_changed"
-        "#{event_creator_name(event)} changed the date to #{event_due_date(event)} on #{event_card_title(card)}"
-      when "card_due_date_removed"
-        "#{event_creator_name(event)} removed the date on #{event_card_title(card)}"
       when "card_title_changed"
         "#{event_creator_name(event)} renamed #{event_card_title(card)} (was: “#{h event.particulars.dig('particulars', 'old_title')}”)"
       when "card_collection_changed"

app/models/user/day_timeline.rb

@@ -40,9 +40,6 @@ class User::DayTimeline
       card_published
       card_closed
       card_reopened
-      card_due_date_added
-      card_due_date_changed
-      card_due_date_removed
       card_collection_changed
       card_postponed
       card_triaged