I'VE DONE THE 9/11 MEMORIAL POSTS EACH YEAR, and this one isn't any easier than the ones before. You can read the earlier stuff here,here, and here. And this post from the morning of September 11, 2001 still holds up pretty well.
I'm observing the anniversary by giving shooting lessons to a Marine (my secretary, who says that the Corps trained him admirably as a rifleman, but not so well with a handgun, which turns out to matter for a combat engineer defusing IEDs and the like, he found). That seems like a good way for me.