On Aug 7th SDTC will be holding it's 57th running of the Balboa Park 8 mile race which goes through Nate's Point. SDTC has placed signs at each entrance to the off leash area notifying the users that this is coming up. On that Saturday they will be using yellow caution tape from swing gate to swing gate to create the corridor for their race participants and will have monitors out there. This race will be held early and the runners should be through Nate's Point quickly.
But please keep in mind that that swing gates will be open for the duration of the race, not to mention lots of runners going through, so you may want to avoid the dog park saturday morning August 7.