Any Saturday/Sunday morning C & C’s in San Francisco proper ?

I might’ve asked this before, but I’ll be visiting in S.F. again over a one weekend next month and was wondering if there are any early morning Cars & Coffee type gatherings within short(ish) driving distance from Union Square area, like in or around Embarcadero, Wharf, Marina, Presidio, G.G. Park, etc ?

I know of some outside the city, but don’t have enough time to go that far and be back at the hotel by no later than 10am on both days.

 

Edit:

 

I was just told about one in Ocean Beach area on Saturday mornings, but no details were available.
Anyone here know more about it, like the time & exact location or other C & C’s in the city ?