handle event subtitle in hero

assets/sass/_theme/sections/events.sass

 .events__page
+    .hero
+        h1 span
+            display: block
+            color: $color-text-alt
     .lead
         @include h3
     @include media-breakpoint-down(desktop)

layouts/partials/events/hero-single.html

 {{- $title := or .Params.header_text .Title -}}
+
+{{ with .Params.subtitle }}
+  {{- $title = printf "%s <span>%s</span>" $title . -}}
+{{ end }}
+
 {{- partial "header/hero.html"
-      (dict
-        "title" $title
-        "image" .Params.image
-        "sizes" site.Params.image_sizes.sections.events.hero_single
-        "context" .
-      ) -}}
+  (dict
+    "title" $title
+    "image" .Params.image
+    "sizes" site.Params.image_sizes.sections.events.hero_single
+    "context" .
+  ) -}}

layouts/partials/header/hero.html

@@ -31,7 +31,7 @@
             <p {{ if $subtitle_is_summary -}} class="lead" {{- end -}}>{{ partial "PrepareHTML" $subtitle }}</p>
           {{- end -}}
           {{- if $description -}}
-            <p class="h1">{{ partial "PrepareHTML" .description }}</p>
+            <p>{{ partial "PrepareHTML" .description }}</p>
           {{- end -}}
         </hgroup>
       {{- else -}}