FRIDAY: >> Ruth Reichl, editor-in-chief of Gourmet Magazine and former food critic at The New York Times, comes to Politics and Prose to discuss “Garlic & Sapphires,” a memoir of her times as a food critic. 7 p.m. Check out an interesting interview with her here, from back in 1996. >> Today marks the start of the Bethesda Literary Festival, which continues all weekend. The festival features contests, readings and participants such as the Post’s…