Go in the morning, sign your name up, leave your headshot, wait long enough to find out what's going on, go do what you have to do, and come back. Usually they don't see non-equity until near the end of the day for a call like that, if at all, so if you just need to be gone for a few hours you probably won't miss anything (but more waiting).
"I thought that that was just going to be a like one shot deal for me, you know, but they kept talking about it like, 'when we do the production, when we do the production', and I was like, 'yes, yes, when you do the production, cool, I will come and see it'". - John Gallagher Jr. on SA