Here's what's going on today (Saturday, Sept. 22): Oceanographer Jean-Michel Cousteau speaks and shows some of his films at 7 p.m. at the Trustees Theater. The free event is part of the Gray's Reef Ocean Film Festival. The Unchained Tour, with author Neil Gaiman, is sold out at the Knights of Columbus Hall. Catch the dance performance "Twist," from multiple local choreographers, onstage at the Savannah Arts Academy (at 7 p.m.). In the clubs: Black Tusk returns, with Dead Yet? and Halmos, to the Jinx. Sumilan is at Live Wire; Hang Fire's got KidSyc@Brandywine with Electric Grandma. The great bluegrass band Frances Mooney & Fontanna Sunset has an 8 p.m. show at Randy Wood Guitars in Bloomingdale.