Everyone's looking for two-for-the-price-of-one sales this time of the year, and this concert fits that bill. To the North Carolina Symphony, add a procession of Cirque aerialists, jugglers, acrobats and contortionists performing with the orchestra behind them. The program has a holiday theme, which could amp the default schmaltz of Cirque past some tolerance levels, but acrobats swinging out over the first few rows and strongmen toting balancers around? Sometimes you just have to let go and have fun, especially in the season of egg nog. The show runs twice today, preceded by an 8 p.m. Friday performance.