diff --git a/apps/dav/lib/CalDAV/CalendarImpl.php b/apps/dav/lib/CalDAV/CalendarImpl.php
index a4f4fb9835741..1c22625f31639 100644
--- a/apps/dav/lib/CalDAV/CalendarImpl.php
+++ b/apps/dav/lib/CalDAV/CalendarImpl.php
@@ -28,6 +28,7 @@
 use Sabre\VObject\Component\VEvent;
 use Sabre\VObject\Component\VTimeZone;
 use Sabre\VObject\ITip\Message;
+use Sabre\VObject\Node;
 use Sabre\VObject\Property;
 use Sabre\VObject\Reader;
 use Sabre\VObject\UUIDUtil;
@@ -293,18 +294,41 @@ public function export(?CalendarExportRange $range = null): Generator {
 	 * @since 31.0.0
 	 * 
 	 */
-	public function import(CalendarImportSettings $settings, VCalendar ...$vObjects): array {
+	public function import(CalendarImportSettings $settings, callable $generator): array {
 
 		$calendarId = $this->getKey();
 		$outcome = [];
-		foreach ($vObjects as $vObject) {
-
+		foreach ($generator($settings) as $vObject) {
+			
 			$components = $vObject->getBaseComponents();
+			// determine if the object has only one base component type
 			if (count($components) > 1) {
-				throw new InvalidArgumentException('Import failure: objects can not contain more than one base instance object');
+				if ($settings->errors === 1) {
+					throw new InvalidArgumentException('Error importing calendar object, discovered object with multiple base component types');
+				}
+				$outcome['mbct'] = ['One or more objects discovered with multiple base component types'];
+				continue;
+			}
+			// determine if the object has a uid
+			if (!isset($components[0]->UID)) {
+				if ($settings->errors === 1) {
+					throw new InvalidArgumentException('Error importing calendar object, discovered object without a UID');
+				}
+				$outcome['noid'] = ['One or more objects discovered without a UID'];
+				continue;
 			}
 			$uid = $components[0]->UID->getValue();
-			
+			// validate object
+			if ($settings->validate !== 0) {
+				$issues = $this->validateComponent($vObject, true, 3);
+				if ($settings->validate === 1 && $issues !== []) {
+					$outcome[$uid] = $issues;
+					continue;
+				} elseif ($settings->validate === 2 && $issues !== []) {
+					throw new InvalidArgumentException('Error importing calendar object <' . $uid . '>, ' . $issues[0]);
+				}
+			}
+
 			$objectId = $this->backend->getCalendarObjectByUID($this->calendarInfo['principaluri'], $uid);
 			$objectData = $vObject->serialize();
 
@@ -316,12 +340,18 @@ public function import(CalendarImportSettings $settings, VCalendar ...$vObjects)
 					$objectId,
 					$objectData
 				);
-			} elseif ($objectId !== null && $settings->supersede) {
-				$this->backend->updateCalendarObject(
-					$calendarId,
-					$objectId,
-					$objectData
-				);
+				$outcome[$uid] = ['Created'];
+			} elseif ($objectId !== null) {
+				if ($settings->supersede) {
+					$this->backend->updateCalendarObject(
+						$calendarId,
+						$objectId,
+						$objectData
+					);
+					$outcome[$uid] = ['Updated'];
+				} else {
+					$outcome[$uid] = ['Exists'];
+				}
 			}
 		}
 
@@ -329,4 +359,22 @@ public function import(CalendarImportSettings $settings, VCalendar ...$vObjects)
 
 	}
 
+	private function validateComponent(VCalendar $vObject, bool $repair, int $level): array {
+		// validate component(S)
+		$issues = $vObject->validate(Node::PROFILE_CALDAV);
+		// attempt to repair
+		if ($repair && count($issues) > 0) {
+			$issues = $vObject->validate(Node::REPAIR);
+		}
+		// filter out messages based on level
+		$result = [];
+		foreach ($issues as $key => $issue) {
+			if (isset($issue['level']) && $issue['level'] >= $level) {
+				$result[] = $issue['message'];
+			}
+		}
+
+		return $result;
+	}
+
 }
diff --git a/lib/public/Calendar/CalendarImportSettings.php b/lib/public/Calendar/CalendarImportSettings.php
index be10a1736d852..a2e707b3e3033 100644
--- a/lib/public/Calendar/CalendarImportSettings.php
+++ b/lib/public/Calendar/CalendarImportSettings.php
@@ -17,9 +17,8 @@ class CalendarImportSettings {
 
 	public string $format = 'ical';
 	public bool $supersede = false;
-	public bool $emitEvent = false;
 	public bool $emitITip = false;
-	public int $bulk = 32;
-	public int $validate = 1;	// 0 - no validation, 1 - validate and skip on issue, 2 - validate and fail on issue
+	public int $errors = 1; // 0 - continue, 1 - fail
+	public int $validate = 1; // 0 - no validation, 1 - validate and skip on issue, 2 - validate and fail on issue
 
 }
diff --git a/lib/public/Calendar/ICalendarImport.php b/lib/public/Calendar/ICalendarImport.php
index 0f28bb4ad4666..13cc6b76a3e70 100644
--- a/lib/public/Calendar/ICalendarImport.php
+++ b/lib/public/Calendar/ICalendarImport.php
@@ -23,8 +23,8 @@ interface ICalendarImport {
 	 *
 	 * @since 31.0.0
 	 * 
-	 * @param VCalendar $vObjects
+	 * 
 	 */
-	public function import(CalendarImportSettings $settings, VCalendar ...$vObjects): array;
+	public function import(CalendarImportSettings $settings, callable $generator): array;
 
 }