Most accredited zoos do this and you don't have to work there to join up! It is a lot of fun and doesn't cost that much to participate. You might ask around and see if your favorite local zoo hosts their own bowl-a-thon. I know I'm going to mine!
To learn more about bfr see the following link:http://www.aazkbfr.org/
What is BFR? "Bowling For Rhinos (BFR) is a Bowl-A-Thon fundraiser were 100% of all proceeds will go directly to support three Rhino Conservation Projects conserving four species of Rhino. The three rhino conservation projects are: Lewa Wildlife Conservancy (LWC) in Kenya, Ujung Kulon National Park in Java, Indonesia and Bukit Barisan Selaton National Park (BBSNP) in Sumatra, Indonesia."