It will be held at a private residence in the Del Mar Country Club. The most likely place for a rally/protest appears to be right in front of the main entrance at the intersection of San Dieguito Road and Camino Santa Fe.
Place: Del Mar Country Club Address: 6001 Clubhouse Dr, Rancho Santa Fe, CA 92067 Time: 4:30 pm (suggested start time) Date: July 13th (Wednesday) Click to download a map in PDF format
This report by NBC 7 states that Trump will arrive at 5:30 pm. If you want to be sure to see him arrive, it’s best to be there very early.
The event is listed as a reception/dinner. So, he would be expected to arrive in the late afternoon or early evening.
There is some room to park along San Dieguito Road in the dirt. In case there is not enough parking you may want to carpool or be prepared to park somewhere else and use Uber or Lyft to get to the Country Club.