Maybe i'm just an ignorant newbie…but what would be unethical about having it screenprinted if the show still hasn't taken place? Its not like he is producing show posters post-show. And this poster rocks! Everybody can tell that.
Give him a break, all he eats is DiGiorno's.
i know it is kinda late to add this comment, but as a designer, if we create a piece that disagrees with the artist(s) it represents, isn't that kinda failing as an artist? Our job is not solely to make a purely aesthetically pleasing poster, right?