is it possible to restrict the user when editing/deleting an event? e.g. if a certain user has created an event only he/she can edit/delete this?
You can customize the event properties so certain actions (moving, clicking, etc.) are disabled:
You can also add visual hints on read-only status using custom HTML or active areas:
You should always check the permissions in the action event handlers even if you disable it (e.g. EventMove). You can inform the user about the result using the message bar: