Things to do in D.C. this weekend: Trey Songz, Brewer's Ball Sensual R&B singer Trey Songz performs at DAR Constitution Hall this weekend. Kyle Gustafson/For The Post This weekend, our favorite events include a Trey Songz concert, a beer and food tasting for charity and Shakespeare performed in ... Klingon. Read some of the highlights and then see our full list of a dozen ideas for things to do this weekend. Justin Bieber may have an army of Twitter followers almost 18 million strong, a successful concert film and better name recognition, but R&B singer Trey Songz can just as easily make the ladies swoon, using his seductive tunes. See him at DAR Constitution Hall on Saturday. Normally, you wouldn't be able to enjoy a beer at Nationals Park until the baseball season gets underway in April. But the Brewer's Ball, a charity event held at the stadium that benefits the Cystic Fibrosis Foundation, allows you to enjoy beers from Port City Brewing Company, DC Brau and Chocolate City Beer with the backdrop of a baseball diamond. After the wild success of its first fundraiser in Klingon, WSC is back with a new work by the Bard delivered in the famed "Star Trek" language, featuring a soliloquy from Hamlet. Read on the full list of the best events this weekend.