Another one we can thank Lollapalooza for: Collegiate New York jangle-pop rockers Vampire Weekend -- whose third album “Modern Vampires of the City” is shaping up to be one of the year’s most widely acclaimed albums – have added an Aug. 5 date at Orpheum Theatre to their summer tour itinerary. The gig is one day after the band performs in Chicago for Lollapalooza. Tickets go on sale Friday at 10 a.m. for $35 and will be available through the State Theatre box office and Ticketmaster. Pre-sale offers begin Thursday. VW joins the busy first week of August that also includes the National, Postal Service and Killers all at Roy Wilkins Auditorium – also all Lollapalooza spillovers.