The tryouts were open to the public. I haven't heard if there will be other public tryouts. But you could always give them a call and see.
From the azrattlers website.
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RATTLERS TRYOUTS MOVED TO VETERAN'S MEMORIAL COLISEUM
The Arizona Rattlers will be holding their annual open tryouts on Sunday September 21st and Monday September 22nd at the Veteran’s Memorial Coliseum. The tryouts were to be held at America West Arena, but were moved due to construction at AWA.
The two-day event will be open to the public, and will be broken down by positions. Kickers will workout Sunday beginning at 9:00 AM; followed by quarterbacks, and Wide Receiver/Defensive Backs at 1:00 PM. Fullback/Linebackers and Linemen will work out Monday, beginning at 9:00 AM.
Athletes wanting to participate can register at the event for a fee of $45. The Coliseum is located at 17th Avenue and McDowell Road. Registration begins at 8:00 AM Sunday for Kickers, and 12:00 PM for QB's and Receivers. Registration starts at 8:00 AM Monday.
The Rattlers will go for their third straight ArenaBowl beginning in February 2004. For more information, call (602) 514-8300, or log on to
www.azrattlers.com.