After a massive two-year rebound in concerts, Ticketmaster parent company Live Nation Entertainment Inc. is hoping to keep the momentum going for its top and bottom lines — in part via efforts to upsell customers on premium-tier offerings and to price tickets based more directly on concertgoer demand. The company, during its quarterly earnings call on Thursday, said it still had plenty of room to expand its so- called platinum ticket offerings — those that use “dynamic pricing,” in which prices are tied to ...