diff --git a/inc/class-eventbrite-api.php b/inc/class-eventbrite-api.php
index 4f25302..8f300cd 100644
--- a/inc/class-eventbrite-api.php
+++ b/inc/class-eventbrite-api.php
@@ -93,6 +93,10 @@ public static function call( $endpoint, $query_params = array(), $object_id = nu
 			$endpoint_url = trailingslashit( $endpoint_url . absint( $object_id ) );
 		}
 
+		if ( ! isset( $query_params['locale'] ) ) {
+			$query_params['locale'] = get_locale();
+		}
+
 		if ( 'GET' == $method ) {
 			$endpoint_url = add_query_arg( $query_params, $endpoint_url );
 		} else if ( 'POST' == $method ) {
diff --git a/inc/class-eventbrite-manager.php b/inc/class-eventbrite-manager.php
index a0c2b8b..673eee5 100644
--- a/inc/class-eventbrite-manager.php
+++ b/inc/class-eventbrite-manager.php
@@ -112,6 +112,9 @@ protected function validate_endpoint_params( $endpoint, $params ) {
 		}
 		unset( $params['page'] );
 
+		// The 'locale' parameter is valid for any endpoint
+		unset( $params['locale'] );
+
 		// Compare each passed parameter and value against our valid ones, and fail if a match can't be found.
 		foreach ( $params as $key => $value ) {
 			// Check the parameter is valid for that endpoint.
@@ -335,6 +338,10 @@ protected function get_endpoint_params() {
 					'created_asc',
 					'created_desc',
 				),
+				'show_series_parent' => array(
+					true,
+					false,
+				),
 			),
 		);