Elspeth does a fair amount of the negotiating for this - she does run PR. Harley, presently thirteen, is allowed to sit in on a few of the storyboarding discussions - the documentary will not be fictionalized, but they still have concern for narrative flow. It's going to be very long, after all.
Significant portions of the documentary will be conjured recordings of events, from outside or even first-person perspectives, but an entire segment is devoted to personally profiling members and peripheral associates of the Golden Coven, one by one. Harley's not on the list - it's mostly a history documentary, with younger generations present almost entirely for 'where are they now' color, and he's not, technically, her son - but Elspeth and most of her family is. And Harley is permitted to lurk around the studio setup while various people prep with their interviewers, or eavesdrop, or - if they are sufficiently non-vampiric to allow makeup to stick - get that applied. It's a big production; the supernatural community would have found it just as convenient to spread it out, but the film people want everything taken down, edited for a consistent look-and-feel, and released according to schedule within a certain time frame.
So there are a lot of people around. Mostly vampires, but plenty of hybrids - there are most of Emmett and Rosalie's kids, over there, with the proud parents themselves - and wolves; Jacob is over with Elspeth - and even a few humans, ranging from imprints to Lizzie who's with Carlisle, Esme, and Lily, and also Alice and Jasper and their son Brandon. People not normally seen around the Golden Capitols have been hauled in. There's Marcus, no longer as craquelure thanks to magic, and Didyme at his elbow, literally radiating happiness. (Bella rendered her power opt-in along with several other mind-affecting abilities that can't be turned off, but it's very inviting, so people usually do so opt.)
And of course Bella and Edward themselves are present, flitting around, mingling. Their interviews aren't until later.
Kerron waves to Harley when he shows up.
"Why are you even here, are you getting in everyone's way? I'm getting in everyone's way," Harley says brightly.
"I'm not important enough to be here on my own merits, but I'm here to talk about Safesun," says Kerron. "Maybe lean into frame when Dad gets interviewed. Thwarted anyone's schedule yet?"
"Are humans supposed to eat entire pies?" asks Kerron dubiously. "Is this a full-sized sugary kinda pie we're talking about?"
"Sounds like it. Did your wolf get the same kind to be fair or would that've been too repetitive?" It amuses Kerron to speak as though Harley is Zeus's imprint, solely on the basis of the amount of time they spend together.
"Makes sense. I try not to eat too much solid food unless it's for social reasons. Makes my hair grow faster."
"I did grow my hair out for a bit when I was six but I didn't care for the look. Besides, there's apparently a guy in another world who looks like me but isn't an alt, and he has his down to the shoulder."
"I will thwart it with a set of clippers and you'll run out of pie crusts."
"You know, I don't think anyone has actually experimented with the appetite capacity of half vampires? I know we can eat as much as wolves do if we want, I dunno what happens if someone just keeps offering us pie and we never say 'no I couldn't possibly'."
"Sure, we should do that sometime. I think I'd get sick of pie in particular at some point, though, might have to throw in mozzarella sticks and swordfish steak and chicken soup and whatnot for variety."
"Besides, she does fancy molecular gastronomy. Deconstructed haggis or whatever's new this week. If she ever made a 'pie', the crust would be over here, probably raw and cut into some kind of shape with a cookie cutter, and the fruit would be over here arranged in a flower, and there'd be a little pile of cinnamon-sugar over here and then she'd drizzle it all with a caramel spiral and lecture everyone on how to eat it."