Okay, I'm doing it! 🎉
I'll drive from Riverside to Santa Barbara, spend two days there, then drive to the train station. After confusing information from Amtrak and other sources I got GREAT information by calling the Santa Barbara downtown parking office:
https://santabarbaraca.gov/government/departments/public-works/public-works-downtown-team/downtown-plaza-and-parking/downtown-parking-lots
They have long-term parking and it's hardly ever full. If it's full I can park in the short-term parking lot at no extra charge if I tell the attendant. If the whole lot is full I can park in the nearby lot 12 or any other city lot. That covers even the most paranoid scenarios. I just need to validate my parking ticket at the station!
I leave the car there, and then:
• take a train from Santa Barbara leaving at 12:21 and arriving in Emeryville at 9:31 pm
• Brendan Fong will drive me to my hotel
Then I'll spend a week in Berkeley talking to category theorists and maybe other mathematicians and random fun folks!