The Email information is not limited to the Events product but includes other products. This applies to tickets created by Events Rules.
The ticket email contains the following:
Summary of the event request
Requested locations/rooms
Dates/times
Additional details were collected using custom fields
Some custom fields may not appear under Additional Details based on the field type and user input.
For example, if no options are selected for a multi-select custom field, this custom field will not appear on the email notification.
This also applies to the Event Approval Emails.