Send me a reminder to send an email to Gretchen about dinner on  Friday.
[IN:CREATE_REMINDER Send [SL:PERSON_REMINDED me ] a reminder to [SL:TODO [IN:SEND_MESSAGE send an email to [SL:RECIPIENT Gretchen ] about [SL:CONTENT_EXACT [IN:GET_EVENT [SL:CATEGORY_EVENT dinner ] ] ] ] ] [SL:DATE_TIME on Friday ] . ]