Remind Andi to be at the concert at 8 pm; alert her 45 minutes before
[IN:CREATE_REMINDER Remind [SL:PERSON_REMINDED Andi ] to [SL:TODO [IN:GET_TODO [SL:TODO be at the concert ] [SL:DATE_TIME at 8 pm ] ] ] ; alert her [SL:DATE_TIME 45 minutes before ] ]