The L.A. Paella, Wine & Beer Festival features paellas and “paellas” aplenty. The 2018 event will be held in October at Pershing Square (Hey! An excuse to ride Metro while borracho!)
There’s a decent chance of finding socarrat at these gatherings. I went 2 years ago, and it was very nice. Admittedly, I was also a bit too inebriated to remember whose paella was best, but I do recall enough that it was worth the price of admission. I have zero financial interest in this event - this is purely a public service announcement.