One more art opening tonight, at David Mah Studio, for Northern Exposed: Paintings and Graphics 1992-2002 by H. Douglas Northern. The nine-member women s string ensemble Camerata Romeu, from Havana, Cuba, is at Buckman Performing and Fine Arts Center tonight. Former Grateful Dead members Ratdog are at the New Daisy. Acclaimed Irish singer/songwriter and guitarist Gerry O Beirne is at Otherlands Coffee Bar. And The MudFlaps are at the Blue Monkey.