diff --git a/functions.php b/functions.php
index e83d7f6..f49f355 100644
--- a/functions.php
+++ b/functions.php
@@ -107,12 +107,15 @@ function render_event_jsonld_graph(array $events): string {
     foreach ($events as $e) {
         $start = $e['date'] . 'T' . ($e['time'] ?? '19:30') . ':00+02:00'; // Berlin Zeit im Sommer; vereinfacht
         $price = $e['price'] ?? '';
-        $offers = $price !== '' ? [
+        $validFrom = $e['created_at'] ?? $e['updated_at'] ?? null;
+        $offers = $price !== '' ? array_filter([
             "@type" => "Offer",
+            "url" => event_url($e),
             "price" => preg_replace('/[^\d,\.]/', '', $price),
             "priceCurrency" => "EUR",
-            "availability" => "https://schema.org/InStock"
-        ] : null;
+            "availability" => "https://schema.org/InStock",
+            "validFrom" => $validFrom
+        ]) : null;
 
         $graph[] = array_filter([
             "@type" => "Event",
@@ -121,6 +124,10 @@ function render_event_jsonld_graph(array $events): string {
             "startDate" => $start,
             "eventStatus" => "https://schema.org/EventScheduled",
             "eventAttendanceMode" => "https://schema.org/OfflineEventAttendanceMode",
+            "performer" => !empty($e['speaker']) ? [
+                "@type" => "Person",
+                "name" => $e['speaker']
+            ] : null,
             "location" => [
                 "@type" => "Place",
                 "name"  => $e['venue_name'] ?? "Veranstaltungsort",