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They are the voices in our heads as we go about our business. Some we try to avoid. Others we have embraced for years and years. The who’s who list of personalities attending “Radio Days: A History of Washington Radio” reveals the impressive depth and breadth of D.C. radio. From Dr. Gabe Merkin to Cathy Hughes, from Eddie Gallaher to Brooke Stevens, from smooth Donnie Simpson to sour Greaseman, from the mellifluous Paul Anthony to the adenoidal Weasel to Willard Scott (via tape) and Ed Walker together again as “The Joy Boys!” While the industry continues to congeal into conglomerated monotony, the many people behind these familiar voices remind us that we live in a town capable of supporting the sports ravings of Ken Beatrice and the late-night meanderings of Bill Mayhugh. Sponsored by the D.C. Ad Club, which, of course, depends on radio for much of its existence, the event is hosted by Jim Bohannon and will feature a multimedia stage production covering “every era and every format,” with memorabilia on display from the Radio History Society. If Barry Richards makes it, the evening will be perfect. Reception at 6 p.m.; show at 7:00 p.m, followed by party and buffet dinner, at the Warner Theatre, 513 13th St. NW. $50 (proceeds to benefit the Metropolitan Police Boys and Girls Clubs). (703) 827-0135. (Dave Nuttycombe)