Big group rides
There is apparently a number of semi-regular big group rides in San Diego. There was a "holiday ride" out of Encinitas today that drew a sizable crowd (I see 32 people just in Strava), there is a "belgian waffle ride" (in April?), a "pie ride" (not sure if it's a regular thing or just a route).
Which others are there, and is there a place that lists all of them?