A glum arthouse market may be entering a gateway weekend into happier days after months of distributors — with rare exceptions — pulling out their hair at dismal per-screens averages. That’s because festival buzz is mounting for film after film – from Card Counter, Dune and Spencer (debuted in Venice, opening respectively Sept 10, Oct. 22 and Nov. 5), to King Richard and Cyrano (premiered at Telluride, in theaters Nov. 19 and Dec. 31, respectively).