Blocking an event

You can block an event script, but the events themselves are controled through Acrobat, which you can't do anything about.

Define a variable that you'll use for blocking and then test it before running any event script.

Define the variable by attaching it to the top of the form hierarchy.

if(typeof(xfa.form.form1.bBlockEvent) != "undefined" && !xfa.form.form1.bBlockEvent)
{
.... Do event Script ...
}

Then in the Pre Print event use this script:

xfa.form.form1.bBlockEvent = false;

Don't set this variable up in a script Object. The script objects are re-run every once in a while, so the blocking variable would be reset at arbitrary intervals.