The dedication ceremony of the National September 11th Memorial Museum will take place Thursday morning.
Top officials, including President Barack Obama, will attend alongside the families.
Then, the museum will be open 24 hours a day for the next week so the families can visit any time they want.
It officially opens to the public next Wednesday, but opening day tickets are already sold out.
Locals and out-of-towners both said they planned to visit, though the $24 admission price raised some eyebrows.
"Especially in the initial opening when a lot of locals haven't seen it, I think it'd be valuable to make it as accessible as possible to the people that 9/11 really impacted," said one New Yorker.
"The respect is not to give the money. The respect is to go and pray and be with them," said another New Yorker.
"It's important to really commemorate and do a beautiful beautiful job of just the way the city was able to come back together after such a horrific tragedy," said a third New Yorker.
NY1 will carry the ceremony live starting at 10 a.m.