The Radiators were to play Fort Lauderdale, Fla. the weekend before Hurricane Katrina, but the show was cancelled after the hurricane crossed the Florida peninsula. "I saw friends at CC's and said, 'Man, I've got a weekend off and I'm going to enjoy it!'" the Radiators' keyboardist Ed Volker says, laughing at how wrong he was. Katrina scattered New Orleans' premier jam band the way it scattered everybody else, sending Volker to Baton Rouge, then San Francisco, then Austin, Texas, where he is currently based. The rest of the band is back in Louisiana -- Reggie Scanlan's performing Tuesday nights at the Maple Leaf with New Orleans Live Animals -- except guitarist Camille Baudoin, who evacuated to Minneapolis, Minn. Still, the Radiators have played three weekends a month since the hurricane, and have been active in hurricane-relief efforts. They have played a number of benefits around the country and have contributed downloadable songs to organizations raising money to help New Orleans. A version of "Number Two Pencil" recorded live this spring at Tipitina's is featured on Union, Justice & Confidence, a downloadable album available at nugs.net that benefits Tipitina's Foundation, New Orleans Musicians Hurricane Relief Fund and the Conscious Alliance. The two-disc set also features tracks by Galactic, Phish and Widespread Panic, among others, and many songs were recorded at Tipitina's, which has become one of New Orleans' homes for jam bands. Cover $15.