"A gig poster is an advertisement for a live musical performance. We also accept flyers and handbills. We do not accept promotional, non-music related posters or posters for shows that did not happen. There must be at least one musical performer listed on the poster. (band or DJ). Please add all the bands to the list on the last step of the submission process."
sounds like it's okay to me.
there's nothing here about not submitting bootlegs or fan art