This is the site where I've bought the broadcast to PAS races before, and I do not see where tonigth's race is going to be added
http://www.circletracknetwork.com/
Last time they tried to broadcast, they had problems with the company who was responsible for purchase of the event and/or able to log on.
It would not hurt to tune in around race time 6 pm or so PST or later, and see if things have changed. Eventually Circle Track provided a free feed for the last race (which was much appreciated by many fans at home).