2. It was a nice touch for Faye to have Angus bring Marigold over as well since she (Marigold) could use the hanging-out company too. This also means that Hannelore will be there at the YouTube party too, which is always good for humour.
It will probably go well enough, but it strikes me that in real life, this would be a TERRIBLE idea, and very bad for Marigold. Faye has admitted to having some feelings for Angus, and they haven't really interacted since to defuse any of the romantic tension, and this invitation to come over is definitely her reaching out. As such, it is basically an excuse for her to have a makeshift non-date with Angus and she's just throwing the invitation to Marigold into it to low-ball the situation. It would be one thing if she already DID have plans, and invited Angus and Marigold along, but no--she's making these plans specifically for Angus.
This to me is a Very Bad Idea. If she's going to make plans just for Angus, I think she should only invite Angus--go on a date, as Dora, suggested: it can be something very low key, with few expectations, but private.
Otherwise, it just seems like with all the as-yet unresolved and yet brought-to-the-surface romantic tension between Faye and Angus (just look at how stammery and awkward she's acting around him already), poor Marigold is in for an evening where they both try their hardest to "act normal" and not be flirty or obviously crushy around each other, and pretty much fail.
Sure, Faye should continue to hang out with both Marigold and Angus--and Angus should continue to hang out with Marigold--but not on what is basically Faye's and Angus' unspoken first date!