In the Event Information I have new field. There, the organizer can be selected from the CRM. For the message templates I would like to use this information. If the field is filled, the First name / Email / Phone field of the address should appear in the message. - Where can I find necessary examples and information? Thanks Felix Wordpress 5.3 / CiviCRM 5.19
There are different tokens that can be selected in the message template to populate user details in the email.
For custom fields, you can probably use
More about tokens - https://docs.civicrm.org/user/en/latest/common-workflows/tokens-and-mail-merge/