BRUSH PRAIRIE — The lines were long and parking lots packed at Bi-Zi Farms in Brush Prairie over the weekend, as thousands coursed through the family farm to grab pumpkins for carving before real fall weather sets in. The event only seems to get bigger, proprietor Bill Zimmerman said Sunday afternoon. The farm holds its annual harvest festival the last weekend of September and each weekend in October, he said, and even with construction along Northeast 119th Street in front of the farm, he expected to see about 40,000 guests this year. “We’ve been really shocked.