WCLY-FM (95.5), which has been working since the first of the year on accelerating its adult image, including changing its call letters from the old WPGC, announced some key personnel changes this week.

Allan Hotlen, a veteran of 22 years in radio, was named program director. He replaces Al Casey, who left last week. Hotlen programmed the NBC AM/FM combination in San Francisco, as well as a station there once owned by Gene Autry, and has also worked in New York and Philadelphia. Sherry Berger Ellison, the station's community affairs director for the last seven years, is temporarily hosting the pretaped "Love Songs" every evening at 7. Berger also does the pretaped overnight show, as well as the Sunday issues show "Contact." Judi Fogel has been named news director and morning news anchor. She has been in radio news for the last six years in Baltimore, Wilmington, Del., and upstate New York. Crisis Reports

While Chris Core, part of the afternoon team on WMAL-AM (630), is vacationing in Greece and Egypt for the next two weeks, he plans to file reports on tourists' reactions to terrorism, if the hostage situation in Beirut continues. Before Core joined WMAL in 1975, he was a foreign service officer with the Voice of America and did political reporting. Pitching for Baseball

The effort to attract a major league baseball team to Washington when the leagues expand in 1987 has captured the enthusiasm of local radio stations. At a meeting last week with Charles Brotman, publicist for the old Senators, about 20 stations said they would run public service spots to drum up support for "Baseball Week," June 24-28. The idea behind the week, which the mayor has proclaimed, is to get people to open savings accounts as "pledges" for season tickets. These pledges will be used to convince the baseball hierarchy, which meets in August, of the local support for a team. First out of the dugout last month with specials on the baseball drive was WMAL, which plans to do some additional editorials next week and will air the Old Timers Game from RFK Stadium July 1. WXTR-AM/FM (1560/104.1) is planning a Senators Trivia weekend, starting today. The First Couple Returns --------

The regular Saturday broadcast by President Reagan is now being carried by WMAL at 12:21 p.m., delayed slightly for radio's most invincible broadcaster, Paul Harvey. WMAL discontinued the broadcast last August when it conflicted with the University of Maryland football games. The president is also heard on WTOP-AM (1500) at 12:06 p.m., followed by the Democratic Party response at 1:06 p.m. Meanwhile, Nancy Reagan has returned with her second year of messages against drug abuse. The two-minute programs are distributed by Washington Broadcast News and can be heard on WNTR-AM (1050) throughout the day on Wednesdays, starting at 7:05 a.m. Money and People Appeal

WDCU-FM (90.1) is asking for volunteers to answer the phones during its first fundraiser, Sunday through June 30. Most of the action takes place at its studios at 4200 Connecticut Ave. NW., except for the station's broadcast from the Old Post Office Pavilion Monday from 11 a.m. to 3 p.m. The 3-year-old station would like to reduce the obligations of its licensee, the University of the District of Columbia, according to general manager Godwin Oyewole. The budget is now $200,000, he said. Special Focus

Rudy Maxa will be interviewing William H.L. Brown, president of the D.C. Congress of Parents and Teachers, and Wilmer Cody, superintendent of schools for Montgomery County, at 4 p.m. today on WNTR. Maxa will discuss private schools next Tuesday with representatives from Gonzaga College High School, Landon School and Holton-Arms School . . . WPKX-FM/AM (105.9/730) is presenting a Willie Weekend, keyed to the Willie Nelson concert Tuesday at Merriweather Post Pavilion, where KIX's John Bodnar will emcee . . . Dick Lillard will feature the songwriting team of Leiber and Stoller for the next two Sundays from 8 p.m. to midnight on Extra 104 . . . WPFW-FM (89.3) focuses on the culture and politics of Native Americans Wednesday from 9:30 a.m. to 9 p.m. Produced by Sue DuVall, the day commemorates the 10th anniversary of the shootout on Pine Ridge Reservation in South Dakota. Indian leader Leonard Peltier was later found guilty of killing two FBI agents that day. Since then there have been many efforts to get Peltier a retrial, and his case will be discussed in a segment starting at 7:30 p.m. Datebook

WHUR-FM (96.3) is the official host for the Fort Dupont season, which opens tonight with Tom Browne and Lonnie Liston Smith at 8:30 p.m. Its sister television station, WHMN (Channel 32), will broadcast the concert.