Fab news! I like the reply, but would just say 'Looking forward to it' at the end (remove the seeing you part- a bit too keen). Also, just 'hope you had tons of fun. Don't refer to Felix- he's not important (and I know that probably sounds a bit mean!)
I wouldn't ask him if he's in NY after the 14th- if you're seeing him on Wednesday at the latest, you can ask him then. Can you wait?