After all that talk about a Bruce Springsteen concert here, there will be a press conference today at RFK Stadium to announce the August date for his concert at RFK. Initial reports are that Springsteen, who is returning to the United States after a sold-out tour in Great Britain, will perform only one night here . . .

Irish Ambassador Tadhg O'Sullivan told his friends at still another farewell party for him and his wife Brid that one of his regrets on his new assignment to Moscow is that there won't be a St. Patrick's Day there. The O'Sullivans were toasted at a party Tuesday at the Embassy Row Hotel, where the ambassador spent some time showing the bartender the proper way to make Irish coffee. Among the guests were Sens. Edward Kennedy, Edward Zorinsky, Christopher Dodd and Jesse Helms, Health and Human Services Secretary Margaret O'Shaughnessy Heckler and a number of ambassadors. Unfortunately, through an oversight, someone forgot to invite the Soviets . . .

Reporters and politicians complain all the while they are covering a presidential campaign, but they can't stop talking about it every opportunity they get. The National Journal is taking the opportunity of the publication of "The Almanac of American Politics 1986" by Michael Barone and Grant Ujifusa to invite politicians and the press to a publication party next week at the Journal's headquarters. And so the party-goers won't get homesick, there will be Dallas and San Francisco-type foods as well as Lone Star and Anchor Steam beers . . .

Maverick oil man T. Boone Pickens is in town again, this time to be the keynote speaker at a luncheon today at the Four Seasons Hotel saluting the Top 100 privately owned companies in the greater Washington area. Maryland Gov. Harry Hughes, D.C. Mayor Marion Barry and Caroline Jefferson Moss, special assistant to Virginia Gov. Charles Robb, will be there to honor the firms . . .

It will not come as much of a surprise, but squeaky-clean singer Pat Boone didn't fully approve of some of the songs at the Live Aid concert last Saturday. "I heard Duran Duran talking about dancing into the fire," he said "and songs that were obviously hymns to the Devil and satanic things, while you're talking about feeding the hungry. I find a real inconsistency there." Boone also was offended by the "highly erotic" duet by Mick Jagger and Tina Turner . . .

T-shirts have become the great American means of self-expression and we'll be seeing a wide array of crowing Coca-Cola statements. The popular one with the RIP tombstone reading "Born 1886 Died 1985" now has an overprint of the new Coke Classic coming out of the grave and reading "Back From the Dead." Another shows a legal scroll with the words "We the people made 'em bring Coke back" . . . And at the popcorn stand in the Connecticut Connection there's a sign saying "We have the old classic and the new classic popcorn" . . .