More than 50 of the nation's outstanding individuals will be honored here in June by the American Academy of Achievement. The group includes ex-presidents, Nobel Prize winners, politicians and corporate leaders. They will be in town to meet with 400 award-winning high school students from around the country. Each of the 25 guests of honor at the 1986 Salute to Excellence dinner will be presented with a Golden Plate Award and representatives from each of the last 24 Salute to Excellence dinners will be present. Those expected include actress Elizabeth Taylor, Gen. Chuck Yeager, U.S. delegate to the arms-controls talks Max Kampelman, Nobel Prize winner Dr. Linus Pauling, heart surgeon Dr. Michael DeBakey, Judge John J. Sirica and baseball Hall of Famer Willie Mays. The Rules-for-Lunch Bunch

The Congressional Club is holding a luncheon in honor of first lady Nancy Reagan in May, but it isn't going to be easy for outsiders to attend. With the invitation to the luncheon, scheduled to take place in the Shoreham Hotel's Regency Ballroom, is a notice that reads: "A member must not invite as a guest to the First Lady's Luncheon any of the following": And then by the numbers, 1. A congressional wife who has not joined the club. 2. A former congressional wife who had never joined the club. 3. A former club member (resident or nonresident) who has not rejoined the club. 4. A daughter and/or daughter-in-law eligible for associate membership.

One member of the club who did not want to be identified complained, "This is the kind of nitpicking nonsense that keeps independent, intelligent congressional wives from joining arrogant, snippy little clubs such as the Congressional Club."

Nancy Fuqua, the club's first vice president, said she was surprised at the reaction of a few club members. "We have those rules because we're encouraging membership and this luncheon is the highlight of the year. An organization has to have rules." End Notes

The founders of Washington Inc. -- Gretchen Poston, Barbara Boggs, Ellen Proxmire and Harriet Schwartz -- celebrated the upcoming 20th anniversary of their partnership yesterday at a champagne luncheon at Germaine's Restaurant. The party-hosting business they started in 1966 with $50 and called "Wonderful Weddings," because they organized weddings, is expected to gross $8 million . . .

Democratic Party activist Pamela Harriman, who has been in Barbados avoiding the Washington winter with her husband Averell Harriman, is frequently on the phone to Washington organizing her annual "Democrats for the 80s" fundraiser. The money raised at this dinner goes to U.S. Senate candidates, with hopes to give Democrats a Senate majority in 1986. This year's $1,000-a-plate dinner will be April 22 at the Ritz-Carlton and there is a guarantee that there will be at least one U.S. senator at each of the 33 tables. As it was last year, the big money-raising item is to be the auctioning of a box for six at the Kentucky Derby. The box, which includes a weekend of partying, sold last year for $22,000. A spokesman for the Harrimans said the 94-year-old former governor and ambassador is spending his time in Barbados going to polo matches and swimming 30 minutes daily. He also has a new "state of the art" hearing device and is able to better participate in conversations . . .

Jane Fonda's success never seems to let up. She had the videocassette sales record for her first aerobic workout tape and now her "New Workout" in its first 17 weeks on the market has sold more than 300,000 units . . .

Country singer Crystal Gayle gave birth Monday to her second child, a 6-pound, 5-ounce boy, in Nashville. The singer and her husband Bill Gatzimos named the baby Christos James Gatzimos . . .

Skitch Henderson, the former music director of NBC's "Today" and "Tonight" shows and conductor for the New York Pops, will be the conductor of the Virginia Symphony Pops for the 1986-87 season . . . Twenty-eight days into his latest fast, D.C. homeless advocate Mitch Snyder was admitted to Howard University Hospital last night. His girlfriend Carol Fennelly said, "He's in danger of heart failure . . . If anyone in the White House thinks he's going to make it 40 days, they'll be talking to a corpse" . . .

"Idiot's Delight" doesn't close until March 22, but the Friends of the Kennedy Center planned to throw an after-performance party for the cast last night at the Four Seasons Hotel. Among the guests were to be the show's stars JoBeth Williams, Werner Klemperer and Stacy Keach and Polish Countess Malgosha Tomassi, to whom Keach reported has become engaged. The couple also had a getaway dinner Sunday in a private room at the Red Fox Inn in Middleburg. Among other guests scheduled to attend were actress Karen Akers and her husband Jim, former senator Howard Baker and his wife Joy and the first lady's hairdresser Robin Weir . . .