Add automatic agenda on front page.

src/pvv/side/event.php

@@ -1,10 +1,20 @@
 <?php //declare(strict_types=1);
 namespace pvv\side;
 
-interface Event extends Activity {
+use \DateTimeImmutable;
 
-	public function getStart(); /* : DateTime */
+abstract class Event implements Activity {
 
-	public function getStop(); /* : DateTime */
+	private $start;
+
+	public function __construct(DateTimeImmutable $start) {
+		$this->start = $start;
+	}
+
+	public function getStart() {
+		return $this->start;
+	}
+
+	public abstract function getStop(); /* : DateTimeImmutable */
 
 }