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Level 2

I'll answer my own question:

the problem is that I am running my PDF through the "Apply Usage Rights" service in Workbench, and the only usage right I had checked was "Digital Signatures."  I went back and checked the "Basic form fill-in" usage right and that fixed the submit button.  I did change my code a bit, replacing "this.resolveNode("#event").submit.target" with "this.event__click.submit.target" but I think either would work.