Use template function and load as needed

includes/shortcodes/class-sp-shortcode-event-list.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Event List Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Event_List
+ * @version     0.7
+ */
+class SP_Shortcode_Event_List {
+
+	/**
+	 * Output the event list shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'event-list.php', $atts );
+	}
+}