Randy Travis’ Aug. 15 concert in Lewiston at the Clearwater River Casino has been officially cancelled, according to the casino’s Facebook page. Ticket refunds and new concert information will be available early next week.Travis received surgery late Wednesday after suffering a stroke. He had been admitted to a hospital in Texas where he was being treated for congestive heart failure when the stroke occurred. The surgery was to relieve pressure in his brain. He is in critical condition, according to various news reports.