org-icalendar-include-body

org-icalendar-include-body is a variable defined in `ox-icalendar.el'.
Its value is

t

Documentation:
Amount of text below headline to be included in iCalendar export.
This is a number of characters that should maximally be included.
Properties, scheduling and clocking lines will always be removed.
The text will be inserted into the DESCRIPTION field.

You can customize this variable.