They're going to have the 1984 Winter Olympics in Sarajevo, where World War I was hatched, but the hostilities today - and of perhaps the next 74 days - surround the International Olympic Committee's provisional award of the 1984 Summer Olumpiad to Los Angeles.

Lord Killanin, IOC president emerged from yesterday's meeting at an Athens hotel with the news that Sarajevo had beaten out Sapporo, Japan, and Goteborg, Sweden, for the right to pump $50 million into building ski jumps, a speed-skating stadium, a bob and luge run and an Olympic village. Yugoslavia will be the first Eastern European country to host a winter Olympics. On an initial ballot, Sapporo drew 33 votes, Sarajevo 31 and Goteborg 10, but on the second ballot most of the Goteborg supporters sided with the Yugoslavs, who ended up 39-36 victors.

As to the bigger, and much, much more expensive summer Olympics, the IOC gave the city of Los Angeles - the sole bidder - until July 31 to sign a contract that conforms to IOC rules and left Mayor Tom Bradley trying to calm restless natives back home by declaring, "We made clear we will insist on veto rights on matters of expenditure."

Los Angeles, through its lawyers, had tried to wriggle clear of the IOC's Rule 4, under which the city and the U.S. Olympic Committee jointly would be responsible for arranging the Games and financing them. Killanine and conferees would have none of that, leaving opponents in L. A. City Council crying that the specter of cost overruns (such as the $1 billion debt Montreal incurred in 1976) smacked of an "albatross upon the city for years to come." Said one councilman.

Bradley and supporters hewed to their line that they'll keep it a thrifty, spartan Olympiad - using mostly existing facilities, centerpieced by the Coliseum that was built expressly for the 1932 Olympics. But, just in case, they [WORD ILLEGIBLE] And think of all the tourist income, they stress. But, in just case, they hedged, they can take out insurance protecting taxpayers against financial loss.

Oh yeah? countered opponents. What about these reports that major insurance carriers consider such coverage impossible? And round and round they'll go . . .

Leon Spinks, a 1976 Montreal Olympics favorite, testified before a St. Louis grand jury yesterday and the panel refused to indict the heavy-weight champ on charges of possessing cocaine and marijuana.

Magistrate Judge Oliver M. Collins, dismissed the two drug charges, then accepted the fighter's plea of guilt of driving without a license. Collins, fining Spinks $50 and costs, commented, "I'm glad it turned out that way for you, Leon." And now that Spinks has a Michigan driver's license, "Leon, please be sure to bring that license with you when you come back." Oh, "and Leon," continued the judge, "could we have some autographs for the girls in the courthouse office?" . . .

The ACC forgot to ask Bill Packer before doing away with jump balls. "Jump ball situations are an extremely important aspect of basketball strategy," said the confereence's - and all college basketball's - resident expert, lamenting that the game will be poorer without them. He's right, and how come he wasn't asked at the recent league meetings? . . . Jumpwise, lameduck Maryland guard Jo Jo Hunter was scheduled to leave last night on a tour of Idaho State, Colorado. Nevada-Las Vegas and New Mexico. Word is he will, as earlier reported, wind up at UNLV but Coach Terry Tarkanian is out of his regular allotment of scholarships and if some sort of grant there can't be worked out, Hunter wants to be prepared.

Harold Bell's second annual Spring Celebrity Fashion Show at Chapter II Supper Club, 900 First St. SE, 6-10 p.m. Sunday, gets the sports elite together again to benefit Send a Kid to Camp and Bell's alma mater Winston-Salem State athletic program. Call 347-3792 for info; meantime we can tell yor Earl Monroe, Al Attles, Joe Theismann, Lydell Mitchell, Adrian Dantley, S. R. Leonard are a few of the celebs expected . . . The fourth annual Jewish Week Open Mixed Doubles tennis party comes off Tuesday, 12:30 p.m. (rain date May 30) at Woodmont and Norbeck country clubs to help fund a tennis center in Israel. Call 858-0777 for details . . . On Tuesday, June 6, the National Capital Chapter of the Multiple Sclerosis Society holds its third annual MS Dinner of Champions at the International Inn on Thomas Circle. Honorary hosts: Sonny and Margo Jurgensen. Guest speakers: Pat Summerall and Tom Brookshier. No head table; for your $50, you'll find a star at your table, or for $500, your party of eight will sit with champion of your choice and his/her guest.