THE SLACKERS, ELI (PAPERBOY) REED (Saturday) “Every day is Sunday,” croons the Slackers’ slack-voiced frontman, Vic Ruggerio, while his band mates toot out a coffee-sipping, sleeping-in mix of ska, dub and rock steady. Lest things get too mellow, Eli (Paperboy) Reed, a shrieking, guitar-toting rhythm and blues singer from Massachusetts, will perform his raucous, famously riveting live act. At 8 p.m., Fillmore New York at Irving Plaza, 17 Irving Place, at 15th Street, Manhattan, (212) 777-6800, irvingplaza.com; $16.50 in advance, $20.50 at the door.