"Feature performer" has about 10% of the number of hits that "featured performer" has. In my experience, it's not unusual to find a typo with 20-30% as many hits as the normally spelled phrase. This really doesn't prove anything either way.
A feature performer sounds like someone who performs features (I have no idea what that means and I haven't heard it).
A featured performer is someone whose performance is featured. This is the normal phrase as far as I'm concerned.
Agreed, Myridon, that google hits are a poor way to prove anything. I wasn't trying to show that "feature performer" is an alternative to "featured performer", but that it exists as a separate term with a specific meaning. If you look at the content of those "feature performer" hits, you'll see that it's not a typo, but an established phrase (even if not familiar to everyone); and if you search for "feature dancer", you'll see even more. (Here's
one example that gives a clear definition of "feature dancer" vs "house dancer").
I first came across it when doing some proofreading for a US entertainment organisation. I checked, and discovered that it was a fully accepted term in that business. That was in the context of comedians and singers appearing in night-clubs. Now it seems, as I mentioned earlier and as Tochka remarked, to have become prevalent in the strip-club context.
As for the semantic comparison, I guess you wouldn't object to "
feature writer" (who writes features in a magazine or newspaper), as distinct from "
featured writer" (someone whose works are featured in, say, a literary review magazine or TV show). The semantics are the same for "feature performer/dancer" and "featured performer/dancer".
Ws