The first time Viv was at one of our cons, it was a helluva panel, scheduled for 5:30 pm time slot. Viv complained insisting on a 1pm it was more convenient for her team. Someone allowed it, because Viv's team informed us, that while it's an adult show, the panels don't get graphic or they keep it PG or sometimes PG13 which is 'rare.' This is a lie. They played a clip of an upcoming episode right off the bat Blitzo makes a sex joke and there's a lot of language. It raised concerns after some teenagers attended the panel, got a few complaints from parents that took their teens.
Second Con of ours a different one, that approved Viv to be there enforced a later time slot no exceptions, we ask Morgana or whoever it was speaking for Viv if we should make the panel 18+ only considering the last one. They insist that it's not needed, explain what they plan on doing for it, what they'll discuss, and showed us the clip of the episode they planned on playing ahead of time. This clip was tame, it sounded like a PG-13 panel. Panel happens, they switch the clip on us last minute, Brandon takes a question too far, etc. Other cons with us we make Helluva panels later some we're able to get away enforcing 18+ some aren't due to complaints from Viv&co.
2024 hazbin comes out, they want both a Helluva and a Hazbin panel, they have not had a Hazbin panel with us, but this is around the time that one 9 year old asked a question at Galaxy Con, to protect us, we make both wristband only.
TLDR: Cons can manage depending on organizer, usually at guest request, Viv's team lies a lot and prevents it from being done.