Some shows will have a separate category for "Duo" quilts,
some shows lump them together with other group quilts (Duos and, say, Round Robins),
and some might let the same quilt compete in the general contest against all other quilts.
It's totally up to the show's organizers so you could see the same quilt in different categories at different shows.
But credit should ALWAYS be given - even if it's not asked for specifically on the application :roll: - to the quilter (LA, DSM, or hand) if it was someone different from the piecer/designer/owner of the quilt.
Personally, for smaller guilds shows, I like the Duo category.
I think it's a fair way of categorizing the quilts for competition on that level.
At Houston,
Eta: NOPE , they do have a two person category.
For example, Linda V Taylor & Cheri Meineke-Johnson have made numerous award winning quilts.
http://www.cheriscrystals.com/exhibits_awards.html
One pieces, one quilts (Linda), and then one drowns it in a million crystals. ;-)
Also, there's a couple out of the Netherlands that also collaborate on quilts at that level.