AP 01/17 18:38 EST V0770 CINCINNATI (AP) -- The city has lost two conventions since residents voted to repeal an anti-discrimination law for homosexuals, and gay activists are pressing for other convention organizers to pull out. Gay & Lesbian March Activists-ACT UP Cincinnati organized an economic boycott after voters passed a measure in November nullifying the gay rights section of the city's anti-discrimination law. A federal judge blocked the measure's implementation pending a court challenge that is to be heard June 20. "Things are moving kind of slowly, but we're happy that in the short time the boycott has been in effect, there have been two major cancellations," boycott coordinator Todd Kamm said. "We are hopeful there will be more cancellations." The American Historical Association decided last weekend to cancel its January 1995 conference in Cincinnati. Last month, the city lost the American Library Association's 1995 convention. Both groups said they canceled because of the November vote. The loss of the AHA convention is expected to cost the city $3 million, and the library convention will cost $5 million, said Beth Charlton, spokeswoman for the Greater Cincinnati Convention & Visitors Bureau. She said it was too early to say if other groups might cancel. "Organizations have expressed a need for more information. They have expressed concern," she said. "But at this point, we are not awaiting any other cancellations. Cincinnati made $236 million from conventions last year, Charlton said. The human-rights ordinance, adopted by the City Council in 1992, bans discrimination in jobs and housing on the basis of race, sex, national origin, physical disability or sexual orientation. The measure passed last November deletes the sexual orientation provision. The boycott is patterned after one in Colorado that was launched in November 1992 after voters approved a state amendment repealing local gay-rights ordinances. That amendment is on hold while the Colorado Supreme Court decides whether it is constitutional. Despite the Colorado boycott, the state's ski resorts saw a 40 percent increase in profits before taxes during the 1992-93 ski season, according to a survey conducted for the National Ski Areas Association by an accounting firm. A heavy snowfall and more ski days were among the reasons cited for the increase.