Just a note. Without changing anything I submitted it to iTunes and it all went through, so it suggests the feedvalidator is not foolproof. The system now works well
Just as an addendum.
I fixed the line 11 error… I had a space in the name.
Still having problems with the date. It appears OK but won’t validate
I resolved this by setting private events to showing the time as free as opposed to busy and everything works.i noticed that on the Google calendar if you set it to busy there is an event that appears to show that.