DOCTOR NIGHTLIFE is back. Doctor Demento is back. Damian is back. Hallelujah, there's a bad moon rising. Around town: FRIDAY

MOVING IN HARMONY -- Doris Justis's old acoustic showcase the Harmony Cafe has left Laurel and moved closer to town, setting up shop as Folk Alley at the Washington Ethical Society, 7750 16th St. NW just inside the District line. The inaugural program includes Justis's Side by Side, singer-songwriter Frank Johnson and headliners Sanders, Kass and White, a vocal trio who scat, torch and trade leads, backed only by stand-up bass. And it's smoke-free! ($7; 202/686-9210).

HARPIN' ON THE BLUES -- The scouting reports on L.A.'s James Harmon Band are positively incendiary. Harmon is a blues harmonica barnstorm and apparently an R&B howler to match. This is early Chicago/British blues fusion, Paul Butterfield style -- they never, ever do anything easy. At Baltimore's 8 X 10 ($6; 301/625-2001). SATURDAY

FARE WINDS -- Somehow, in between their shows Friday and Saturday nights at the Barns of Wolf Trap ($14; 703/938-2404), Maine-stream folkies Schooner Fare run down to La Plata for the first annual "I Love the Bay Day" benefit, 10 to 5 at the Charles County Fairgrounds on Route 301, 15 miles south of Waldorf. Also performing are local stalwarts Pete Kennedy, Hazlewood and Side by Side, along with Tom Wisner, whose "Chesapeake Born" was the theme song to the National Geographic special on the bay. Other attractions include seafood, barbecue, traditional Piscataway Indian dishes, hayrides, pony rides, etc. Admission $12 for adults, $3 for kids at the gate, or call 301/843-6133 (local) or 301/645-3904 for information on advance ticket locations.

COLLECTIVE ACTION -- The Market 5 Gallery at Eastern Market on Capitol Hill hosts The Nearest Exit, a showcase of poetry, performance and music featuring the Joe Cardillo Collective, Jesse X, Robert Bove, Andrew Gettler, Madelyn Callahan, Donald Plourde, Uncontrollable Mood Swings and others ($5; 202/544-3927). SUNDAY

HEAD 'EM UP, TAKE 'EM OUT -- Remember when rock concerts weren't Rorschach tests of style? Remember that brief shining moment before teenage angst led straight into yuppie fever? Remember Buffalo Springfield? Big Head Todd and the Monsters are the Rolaids of rock 'n' roll -- articulate, melodic, tight, familiar with the AOR of the British Invasion but thumbing through the Stax as well. In frontman Todd Park Mohr, BHT has a formidable weapon: a deft writer, an inquisitive, intelligent guitarist and a soul-shouter vocalist. At Baltimore's 8 X 10 ($4; 301/625-2001).

GUITAR GALA -- It's a guitar-lover's dream of a different sort, when classical guitarist John Williams and flamenco master Paco Pena triple-bill with the Chilean nueva cancio'n heroes Inti-Illimani at GWU's Lisner Auditorium ($19.50 to $35; 202/432-0200). Inti-Illimani, founded in 1967 amid the ethnic-pride movement that ignited all across Latin America, was exiled for 15 years after the coup that overthrew the Allende government, and was only allowed back in by the Pinochet administration two years ago. The band then joined the Amnesty International tour. The seven members play 16 wind, string and percussion instruments, some indigenous, some European, some African.

LATIN, TWO -- If you prefer your Latin with a slightly different accent, there's plenty of Latin jazz this week, too, starting with Tito Puente at the Museum of Natural History's Baird Auditorium ($23; 202/357-3030). You want to know what the melting pot is? It's when ethnic Puerto Rican New Yawker Puente writes the theme music for "The Bill Cosby Show." Then there's ethnic Mexican Texan (raised in L.A.) Poncho Sanchez, like Puente a percussionist, like Puente a onetime Woody Herman sideman, who brings his own rather more frenetic conga line to Blues Alley Monday and Tuesday ($16; 202/337-4141).

IN BAD COMPANY -- They're back around, but this semi-metal tour is still only alloy: the Rogers- and heart-less Bad Company, and the barber-shock Damn Yankees, with hairs apparent Tommy Shaw and Ted Nugent (at DAR Constitution Hall; $19.50, 202/432-0200). TUESDAY

BO SHOWS -- Bo Diddley's a gunslinger, and he's loading up at Anton's 1201 through Sunday ($28.50; 202/783-1201). Lord, remember when you could hear the blues for the price of a beer? WEDNESDAY

BETTY, TWO -- Washington's favorite rockappella trio-turned-New York funky fave Betty returns for a Halloween costume cabaret blowout at the Hard Rock Cafe at 10th and E ($8; 202/393-7655 or 202/432-0200). And on Thursday, the group opens for "Anything But Love" costar Richard Lewis, the man who proved that intelligence can be both funny and sexy, at DAR Constitution Hall ($16.50 and $18.50; 202/432-0200).