QuiltE

It depends on the show/fair.
You really need to see the class specifics.

I have entered at several fairs now and believe me, it's a nightmare to read and interpret all the "rules", and not just for the who made it part!!!!

Some are very specific that the entrant must have done ALL the work.
Some allow you to enter if you pieced, and someone else quilted, and you must state their name.
Some have classes for one ... and separate classes for the other.
Sometimes only the piecing is judged.
Sometimes only the quilting is judged.
Some have them merged and/or in all sorts of combinations.
Some will only award the Grand Champion to a quilt made solely by one person.
Some will award the Grand to any quilt that has met it's class specifics.

And one Fair (with deluxe prize moneys), had taken a different approach to recognize phenomenal quilts ... you don't even have to put one stitch in the quilt. In your entry, you acknowledge who pieced it, quilted it, the original pattern designer, and the current owner.

So it really is all over the map on this ... and sometimes when you are at the show/fair the class specifications are not noted for the spectators to know the difference.