I don't have any specific plans, but I too will always remember where I was when I found out, watching the footage in horror, coming home and watching my mom watch tv and cry. My dad gave blood, my brother was in the Airforce and so there were fears of deployment (he has served 4 deployments since then). And I think just the fear of the unknown. Does this mean war, what does this mean? etc.
I watched a cool documentary about 9/11 and what touched me the most was the reaction of the people of New York. Here in the mid west it's common to have that neighborly let's help feeling. During that time, New Yorkers bonded together in a way that the city doesn't usually. It was a time of unity.
Anyway, I don't know if we will have any specific ceremonies, but I do have to say that once I met someone from Australia who was here on business. We were at a piano bar and they played a Patriotic song and asked members of the military to stand. Everyone sang along and cheered etc. He told me that he has traveled extensively to many countries and that the USA is the most patriotic country he's been to. So here's a big thumbs up to all you patriots!! I also haven't really educated my son about it b/c I think it's too big of a topic for him yet. Have a great day and thanks for supporting our troops! :-)