The September 11th Memorial Museum will be open to certain qualifying people for free on the evening of September 10th from 5 til closing. You have to register and reserve tickets.
I went during the pre~opening last year. I didn’t want to. I wasn’t ready, but I knew I would want to go someday and I couldn’t bear the thought of going with camera toting crowds of tourists (no offense). It was a good decision for me personally.
Here is the information I got in an email today: