Fixed Event grid not showing due to underscores auto changed to hyphens

assets/js/event-grid.js

+(function ($, Drupal, drupalSettings) {
+    Drupal.behaviors.EventGridBehavior = {
+        attach: function (context, settings) {
+            // adds the css class via JS because Drupal filters underscores and changes them to hyphens
+            $('.event-grid').addClass('cern-view-display-feature_events');
+        }
+    };
+})(jQuery, Drupal, drupalSettings);
\ No newline at end of file

cern_display_formats.libraries.yml

@@ -24,4 +24,6 @@ event-grid-stylesheets:
   version: 1.x
   css:
     layout:
-      assets/css/event-grid.css: {}
\ No newline at end of file
+      assets/css/event-grid.css: {}
+  js:
+    assets/js/event-grid.js: {}
\ No newline at end of file