A source within Nascar says the 2026 San Diego race will run on the Coronado Naval base during Father's Day weekend (June 19-21)

An official NASCAR announcement for San Diego has been scheduled for Wednesday, though the organization has not responded officially to a request for a comment for this story, nor has the city manager or police public information officer of Coronado.

https://www.nbcsandiego.com/news/local/nascar-coming-to-san-diego-for-road-race-in-coronado/3873954/

And no one mentioned that the vintage racing was happening on the base during Speedfest San Diego from about 1998-2015 or so, they simply used K rails to form a big damn track, on the airfield, annually. 

The vintage racing was beautiful, and was a fundraiser for the Navy's Morale Welfare and Recreation Committee

Since they could race the Nascar race cars from 20 some years ago, there's no reason they can't race the current ones next year  https://justacarguy.blogspot.com/search?q=speedfest

Update, a day after I posted the above, Autoweek verified my hunch 

https://www.autoweek.com/racing/nascar/a65491202/nascar-race-naval-base-2026-fans-rare-opportunity/