We also publish events submission_time and decision_time in their json

app/models/event.rb

@@ -88,6 +88,7 @@ class Event < ApplicationRecord
   def as_json(_options = {})
     { type: 'Feature', properties: {
       id: id, name: title, start_time: start_time, end_time: end_time,
+      submission_time: submission_time, decision_time: decision_time,
       place_name: place_name, address: address, city: city, region: region.name,
       tags: tag_list, popupContent: "<a href=\"/events/#{id}\">#{self}</a>"
     }, geometry: { type: 'Point', coordinates: [longitude, latitude] } }