In another of those Republican-Democrat mergers that seem to work, Terry Adamson, one-time press secretary to former attorney general Griffin Bell, was married Saturday to Ede Holiday, executive director of the Commission on Executive, Legislative and Judicial Salaries. Her father, Harry Holiday, is the chairman and former chief executive officer of Armco Inc. The guests at the St. John's Episcopal Church wedding included Bell; FBI Director William Webster; Washington lawyer Ray Calamaro, another former Bell aide, and Los Angeles Times bureau chief Jack Nelson . . .

In a Republican-Democrat merger of a less personal nature, Republican National Committee Chairman Frank Fahrenkopf will be part of a bipartisan group of friends wishing former Democratic National Committee chairman Chuck Manatt well as he takes over the Washington law offices of Manatt Phelps Rothenberg & Tunney. The firm will also be honoring David Ifshin, former general counsel to Mondale for President, and Robert Kabel, former special assistant to President Reagan. Both are becoming partners in the Washington office of the Los Angeles-based firm. One never knows who will be in power next, so it pays to have connections everywhere . . .

That seemingly tireless comedian Milton Berle, whose career began at age 5, checked into Cedars-Sinai Medical Center in Los Angeles last week suffering from fatigue. His wife, Ruth Berle, said Saturday cardiac tests are being scheduled for today for Berle, who will be 77 next month . . .

In the past 18 years, the Statler Brothers have won 23 music awards and the speculation is in their favor to add several more tonight at the 19th annual Music City News Country Awards in Nashville. The quartet from Staunton, Va., has been nominated for seven awards and will be among the hosts of the show from Opryland. The show will also mark the first time singer Barbara Mandrell will perform live since a serious auto accident last September . . .