Not a bad idea.
But Srsly, folks, you should be vigilant EVERY DAY.
Not just when good old Uncle says so.
Pay attention every day, every moment.
Be aware of your surroundings, who is there and what they are doing....Look at body language. Groups. Singletons. Odd behaviors....people out of place. Actions that are not normal for the area...
Just friggin' pay attention. Not just The 4th and maybe the 5th...Every day.
Were I a terrorist, I'd skip[ this weekend and do something on Wed.