I don't want to receive any more event invitations or notifications

To stop receiving event notifications:

1. Click on your profile image in the top right corner of the XING website and choose Settings.
2. Then click on Notifications.
3. Now click on E-Mail notifications and choose Events.
4. Here you can decide which notifications you want to receive by sliding the toggle.
5. The e-mail notification is turned off when the toggle is greyed out.

Here, you can find information on how to deactivate group notifications.