After 20 years of headlining in comedy clubs across the country, radio personality and BET alumnai Sheryl Underwood has honed her outspoken, blunt humor down to a highly effective comedic tool. Styling herself as a staunch, yet sexually progressive, Republican, Underwood’s opinions are bound to stir up controversy as well as laughs. You might have seen her on “Comic View” on BET, ABC’s “Politically Incorrect” or in “Beauty Shop” with Queen Latifah. Now catch her at the Richmond Funny Bone June 28-July 1. $23. 521-8900. S