Check out O'Keans across the street from the Tustin library, OC CA US
Oddly enough, this coffee shop is a kind of intellectual nexus for the area, one of several.
At seemingly random times, some group - Christian intellectuals, Japanese families, Korean families, etc., college students, philosophers, gamers, digerati ... somehow arrive as a cohort and take over the space. There is just enough room inside for 2 or 3 such groups to cluster with a few seats left. O'Keans runs late - 11PM Fridays & Saturdays. BIG parking lot, but often totally filled. More parking on and across the street. Good place for mini-meetups. More tables - 6 or 8 - outside.