Yeah, the process for band posters is : recognise a band (or in this case, maybe a genre). If so, then check the details. That's all the poster needs to convey,

Yeah, the process for band posters is : recognise a band (or in this case, maybe a genre). If so, then check the details. That's all the poster needs to convey, and the most important way for it to do it is by being cool and by appealing to fans of that band/genre/club night/promoter/whatever.