I've always maintained that, even kind of popular shows, rarely sold out before 10, 9:30 at the earliest. HOWEVER, on a recent weeknight, Evan Dando sold out by 8:30. Some things to consider -- he's appealing to the Whitlows/Clarendon Grill crowd in their late 20s who remember him from high school or college days (when most people were exposed to slightly alternative music), and the Thrills are a newer, more under the radar band.
But here's my recommendation. If it's important for you to see the band, get there early -- by 9:00. You can eat in the restaurant, or just have drinks over there with an app. It assures you'll get in, and you can hang with your friends and talk before the music starts. When I really want to see a band, I get to the restaurant and have dinner around 8:00. They come through and let you pay the cover for the show, so you definitely are 'in.'