Sunday’s Black Clock Issue 15 launch at McNally Jackson was packed with people and plastic fold-out chairs despite two lit-event anomalies: it was a Sunday afternoon and there was no booze. The second surprise was explained by the first, and the amount of people by the quality of the magazine, which has published scruffy old literary voices with fresh and squeaky new ones since its debut eight years ago. The theme of Issue 15 was alternative histories of cinema.