According to Max Wertheimer, senior public relations manager for Lagunitas, about 4,700 people attended the festival, which donates all proceeds from beer and merchandise sales to the Chicagoland Rescue Intervention & Support Program, an organization that provides low or no-cost services to help Chicago pet owners keep their pets rather than leave them with a shelter. Founded 10 years ago at the original Lagunitas Brewing Company in Petaluma, the circus is visiting Seattle, Madrid and London, with donations going to local organizations in those cities.