Napa, starting September 23rd and Sacramento starting September 30th. He will be a direct acceptance in both.
There is also Tiburon starting October 7th (entry list not released yet). There is also a good chance he'll play the two Australian Challengers starting October 21st and 28th but these are just guesses on my part.
Nick won't be playing Napa - he will be playing the tour event in Stockholm... I am pretty sure Nick is partnering Gooch tonight for the doubles as well.