The Atlanta Convention and Visitors Bureau (ACVB) yesterday signed two corporate sponsors for the city's "Atlanta: Come Celebrate Our Dream" campaign -- Visa and Delta Air Lines. The two companies offered cash and in-kind services "worth about $1 million." Coca-Cola, BellSouth Corp. and Georgia Power Co. have also been approached for sponsorship money. The campaign will be 90% TV ads and, according to ACVB President Spurgeon Richardson, "should become a multimillion-dollar campaign" (Susannah Vesey, ATLANTA CONSTITUTION, 2/16). With the slogan, the city is hoping "to create an image" for itself as well as "lure vacationers and conventions." The slogan will be "emblazoned" on T-shirts, mugs and buttons and will be "the centerpiece of an advertising campaign to ride the wave of publicity Atlanta will gain from being host" of the '96 Olympics (Marc Rice, AP/ATLANTA CONSTITUTION, 2/16).