Fri.At 80, Roy Haynes is one of the most recorded drummers in jazz; the man Billboard dubbed "one of the seven wonders of jazz" -- his friends call him Snap Crackle -- brings his quartet to the Clarice Smith Performing Arts Center's Kay Theatre, with a free afternoon discussion at the Center's Kogod Studio Theatre (301-405-2787). . . . Along with locals Fort Knox Five, Los Angeles DJs John Kelley and Simply Jeff celebrate their new releases at Funk 4 Peace 2 (a benefit for the International Red Cross) at Five (202-331-7123). . . . New Orleans-bred, New York-tested trumpeter Terence Blanchard takes a break from his other job as a top film scorer to perform with his sextet at the Kennedy Center Terrace Theater (202-467-4600). . . . As a key session player on "Like a Rolling Stone," Al Kooper tells some great Bob Dylan stories in next week's PBS "American Masters" Dylan offering; the co-founder of Blues Project and Blood, Sweat & Tears performs at the Ram's Head Tavern in Annapolis (410-268-4545).

Sat. Operation Ceasefire will voice opposition to the wars in Iraq and Afghanistan with a day of speeches and lots of music, courtesy of Thievery Corporation, Steve Earle, Le Tigre, Wayne Kramer, Ted Leo & the Pharmacists, Joan Baez, the Bouncing Souls, Jello Biafra, Head-Roc, the Evens (Ian MacKaye and Amy Farina) and Sweet Honey in the Rock. The concert runs from 2 p.m. to 1:30 a.m. (202-232-1724; www.opceasefire.org). . . . Billie Holiday acolyte Madeleine Peyroux and comes-from-a-very-cool-family Martha Wainwright are at Lisner Auditorium (202-994-6800). . . . Iranian superstar Googoosh and Mehrdad return to George Mason University's Patriot Center (703-993-3000).

Sun.Another New Orleans relief concert, this one at the State Theatre in Falls Church, starts at 4 p.m. with the Idle Time Band, Marcus Johnson, Mary Ann Redmond, King James & the Serfs of Swing, Cathy Ponton King, Jim Robeson, Fatskeys, Taylor Carson and Politicks (703-237-0300). . . . More than 75 of Washington's top jazz musicians, including Buck Hill, Jerry Gordon, Jackie Hairston, Vince Evans, Antonio Parker and Michael Thomas, will gather between noon and 9 p.m. at Towne Center Park (adjacent to Westminster Presbyterian Church at 400 I St. SW) for the fourth annual (and free) D.C. Jazz Preservation Festival (202-484-7700).

Mon. Prog-rockers Porcupine Tree perform with a special guest, legendary King Crimson guitarist and theorist Robert Fripp, at the 9:30 club (202-393-0930).

Tues.Experience Unlimited, Backyard Band and other groups perform at six locations in the District and Prince George's County to benefit the United Negro College Fund's Hurricane Katrina relief efforts, sponsored by the Go-Go Coalition. For a list of bands and venues, visit www.gogocoalition.org.

Weds.The inaugural Duke Ellington Jazz Festival kicks off with the Dave Brubeck Quartet at the Lincoln Theatre and Turkey's Fahir Atakoglu Trio just down the street at the Bohemian Caverns (202-232-3611). . . . Steve Dawson, part of the critically acclaimed husband-and-wife alt-country band Dolly Varden celebrates his solo debut, "Sweet Is the Anchor," with Slaid Cleaves at Jammin' Java (703-255-1566).

Thu.The Ellington Jazz Festival continues with the Chico O'Farrill Afro-Cuban Orchestra in an "Duke Goes Latin" concert at the Lincoln Theatre, along with the Ridgetop Syncopators at the Kennedy Center's Millennium Stage, the Paul Zauner Quartet at the Bohemian Caverns, and Larry Coryell, Lenny White and Victor Bailey, who will be at Blues Alley through Oct. 2.

-- Richard Harrington