Sometimes printing an item is inappropriate in the context of the times, and the trauma of the Trans World Airlines hijacking put this one into that category. But in view of the arrival of the former hostages yesterday at Andrews Air Force Base, the sentiments of the item now recounted have come true.

A couple of months ago, on a downer day, we noted that the Marriott Corp. had led us to be depressed because it stopped publishing a classified advertisement that ran, day after day, usually as the first ad in the classified section.

On June 15, just before the hijacking and hostage crisis, it resumed, but taking note of it finally seemed appropriate yesterday: "Marriott Corporation wishes you a happy day."

Indeed, it was!

Marriott's message isn't entirely selfless. By running the ad on a daily basis, the corporation preserves a minimum rate for running want ads any day it chooses to do so. Funds Raised for Surgery

Tomorrow, Independence Day, may be lifeline day for a nice 13-year-old pupil at Buford Middle School in Charlottesville, Va. In addition to participating in the patriotic ceremonies, the local Jaycees chapter will be raising money for an operation that could save the life of Juanise Dyer, who has a rare form of usually lethal bone cancer called neuroblastoma.

The painful surgery involves the injection of needles to withdraw 10 percent of Juanise's bone marrow and "washing" it magnetically of tumor cells.

Local fund-raisers collected more than $55,000 toward the treatment she's already undergoing at Shands Hospital in Jacksonville, Fla. A total of $125,000 is needed. Unfortunately, the state of Virginia turned down Medicaid funding because the procedure is considered experimental.

Among those expected to be in Charlottesville to join in the fund-raiser at McIntire Park is Sen. John W. Warner (R-Va.).

Want to contribute? Send a check to the Juanice Dyer Cancer Fund, care of Sovran Bank, Box 1328, Charlottesville, Va. 22902. Decatur House Celebration

Looking locally for an interesting way to spend the Independence Day afternoon in Washington?

From noon to 4 p.m., the 166-year-old Decatur House on Lafayette Square a block from the White House, built in 1819 for Commodore Stephen Decatur, will be the scene of what is described as "an old-fashioned Fourth of July." A brass ensemble will play Scott Joplin cakewalks and John Philip Sousa marches, with cakes as prizes for the winners of cakewalk dancing contests.

The program is a benefit for the National Trust for Historic Preservation, which took title to the house in 1956 from its last private owner, Mrs. Truxton Beale. The house, a short walk from either of Metro's Farragut rail stations, was the residence of, among others, senator Henry Clay (Whig-Ky.) and vice president (later president) Martin Van Buren.