In the years while the Pioneer Days celebration was canceled (1990-1996), the Halloween and St. Patrick's Day celebrations grew into much larger events. These holidays had always enjoyed a high rate of participation in Chico due to its young population. However, following the loss of Pioneer Days, St. Patrick's Day and Halloween grew in popularity to compensate. Mutual aid was invoked by police each year for several years and a campaign launched by city government to combat the increase in alcohol-related arrests.