I used to work security at a few different venues in and around Austin (Austin Music Hall and the original Backyard primarily) and my boss was good friends with Willie so I worked 3-4 of his 4th of July Picnics. IIRC one was at Southpark Meadows and at least 2 in Luchenbach. Never made it to "Luck"

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My boss was really cool though and liked me so she would hook me up with the best spot to virtually do nothing but watch Willie and all the other shows. I'll never forget the time at SM when she let my wife hang with me in between the stage and barrier while he was playing. There were no other security guards, just us with Willie. Never had to worry about anyone jumping over the rail or anything during his picnics.