with a dramatic leap; a dancer of the Ilarion ensemble from Oshawa; performing at the Ukrainian Poltava; brings Caravan '75 to a smashing finish last night. The dancers; some as young as 6 delighted an overflow crowd with the traditional dances of the Ukrainian steppes. By closing time; the 54 pavilions had clocked a total of 1;988;716 visitors; more than last year but just short of the 2 million attendance that was hoped for.