I'd mentioned that it looked like I could go the audition at 10 and still make it to the shoot at 11, but it was going to be close. I didn't mention that at first it looked like it was going to be impossible. The audition is in West Los Angeles. The shoot was at Balboa Park, which according to Google Maps is in the northeast corner of Griffith Park--far enough that there's no way I'd be able to get there in time.
However, Google Maps showed more than one Balboa Park in the Los Angeles area, and on a second look it turned out that the Balboa Park in Griffith Park wasn't the Balboa Park the shoot was at. (In fact, on closer examination, it seems the Balboa Park in Griffith Park doesn't actually exist... turns out the address Google Maps gives for that Balboa Park is in fact the address of the Los Angeles Zoo, and the better-known San Diego Zoo happens to be in yet another Balboa Park (which is located, unsurprisingly, in San Diego), so I suspect this is a mix-up on the part of Google Maps.) The Balboa Park the shoot is at is in Van Nuys, about a half hour from the audition location. So... if I got to the auditions right at 10:00, I could feasibly still make it to Balboa Park in time for the shoot.
However (again), the e-mail with the info about the shoot had also said that there was a chance that the shoot location might be changed to Hansen Dam. And, well, I got a text about an hour ago, at 9:20: "Call time is now at hansen dam not balboa park". This changed things, because Hansen Dam was significantly farther from the shoot location, and there was no way I could get there in time after an audition at 10:00.
I only had to worry about this for a minute, though, because at 9:21 I got a second text: "U can actually come at 12:30".
So... I guess things have worked out after all. We'll see how tomorrow goes...