Nite Moves (SB) starts May 1. That is a fun weekly swim and run.
Running Warehouse (SLO) has regular runs that were getting pretty sizeable groups, but I'm out on injury so I haven't run in a long time. I don't know the latest mojo on that group.
SLDC has a trail running group that I've gone out with, but again... injured so I don't know how the group is doing lately.
K-Man seems to have some pretty good group rides in A-Town.
SLO Dolphins meet in Avila on Sunday for 1-2 mile ocean swims. That is my latest jam. No club to join or fees to pay. Just people swimming.
SLO RoadRunners run 3x a week (again, injured).
There is a gal who has been doing master swim at Cuesta College that looks interesting. Endurance Cubed? She does coaching so I don't know if the rides are for her athletes only.
SLO Bike Club is always a mix of interesting.
Cal Poly has a masters swim team if you want to chase the feet of college kids. Probably 30% non-kids.
If you pop into any of the trail runs, century rides, or ocean swims in any of the areas on the Central Coast you meet pretty much everybody after 3-4 events.
Honestly... I haven't found much of a "scene" up here in SLO Town. Then again, I don't try particularly hard to do so...
Good luck!
Hillary Trout
San Luis Obispo, CA
Your trip is short. Make the most of it.
https://www.slogoing.net/