In such cases you can simply open the appointment in question under https://eu5.bookingkit.de/calendar/index and click “Email to all participants”. In the text editor which opens automatically you can insert not only text, but also links, e.g. to important documents on your website.
Please note that emails sent this way are not automatically saved anywhere in the respective appointment, i.e. you cannot see the history of all emails you had sent to the participants.
Do you have any other questions about this? Please get in touch with us at firstname.lastname@example.org