re: Does the Saints have open tryouts?

No they don't... The only way to get a tryout is to arrange a workout with saints scouts. This is also hard to do, unless you played college ball and your coach invites you to your colleges pro day. Another way would be if you trained with a professional who also trains NFL players, or prospects, they get individual workouts with scouts(and often others jump in with them for their workout)....

As for the beerman he played in the AFL for a few years and also was on the Eagles training camp roster, and was signed by the saints a year later as a mini camp tryout player. After that he was signed to the training camp roster and the rest is history.