Roseboom Power Days Warms Up For Sunday Tractor Parade, More Four farmers/antique-tractor collectors from Australia were among the surprises at Roseboom Antique Power Days, revived today and Sunday on John Deere Road after a one-year hiatus. The visitors, who arrived in L.A. Aug. 8, and have attended tractor events all along Route 66, are, left from foreground, Eric Larson from Victoria, and Ivan Quartermaine, Matt McQualter of Aussie Antique Tractor Parts, and Byron Mills, all of Western Australia. Larson and…