Photo by Connie Oswald Stofko The Mum Exhibit at the Buffalo and Erie County Botanical Gardens is taking a spooky turn this year with a MUMster Mash theme. There will be a mad scientist’s lab, a spooky cemetery, ghosts, mummies and, of course, thousands of mums. The 119th Mum Exhibit will be held from Saturday, Oct. 5 through Sunday, Nov. 3 at the Botanical Gardens, 2655 South Park Ave., South Buffalo. Hours are 10 a.m.-4:30 p.m. daily. The Mum Exhibit…