Some elements of the automated text inserted into calendar events autoresponders are automatically generated content and controlled by Site Data Parameters (SDP). Contact Support and reference this article. 
  1. CALENDAR_EMAIL_FROM_ADDRESS: This site option specifies the sender email address to be used in confirmation and reminder emails from the Calendar application.
  2. CALENDAR_EMAIL_FROM_NAME: This site option specifies the sender name to be used in confirmation and reminder emails from the Calendar application.
  3. CAL_SIGNATURE_CLOSING: This site option represents the Closing (such as "Sincerely,") used at the end of all outgoing auto-responder emails related to events.
  4. CAL_SIGNATURE_IMAGE: This site option represents the Image file (gif) to be appended at the end of all outgoing auto-responder emails related to events. The Value can be specified as an absolute URL or a relative URL (such as .../images/signature.gif).
  5. CAL_SIGNATURE_MAIL_FOOTER: The text entered as the Value for this site option will display in the footer below the signature, in the conclusion to all email messages related to events sent from your site.
  6. CAL_SIGNATURE_NAME: The text entered for this site option will display as the name below the signature commonly used in messages related to events sent from the site and on certain site pages.
  7. CAL_SIGNATURE_TITLE: The text entered for this site option constitutes the title appended to the signature used in email messages related to events sent from your site as well as certain pages on the site itself (notably Thank You pages that display after ticket purchases).
  8. CAL_INVITATION_INCLUDE_DESC: Set to TRUE to include event information automatically in event invitations.