Robert Redford said Friday that Soviet filmmakers and scientists will attend conferences at institutes that he established in Utah in the early 1980s. Redford said the agreements resulted from meetings he had in the previous four days with prominent members of both professions. The American actor presided at the showing of eight of his movies in Leningrad and Moscow. Another exhibition was scheduled for Saturday and Sunday in Tbilisi, capital of Soviet Georgia. He also moderated a two-day conference in Moscow on depletion of the ozone layer in the upper atmosphere. Redford said the first conference, dealing with ecology, will be held this fall at his Institute for Resource Management in Sundance, Utah, and the Soviet Academy of Sciences has agreed to exchange information with the institute. Two Soviet movie makers will visit his Sundance Institute for Independent Filmmakers in 1989 to confer with American counterparts, he said.