ms_miracle:
By birth, Avia may have been an immortal New God, but in many of the ways that counted, she very much considered the Earth to be her home. It was, simply put, the groovy-est place in the universe. And one of the things that made it that way was the awesome holidays, which included Halloween.
In between hero-ing, Avia had mostly been performing in Vegas, along with handling some of the more charitable ends of Miracle Inc. She actually rather liked the casino, a super-hero themed one that had gone up a few years ago. She was packing the house every night, selling plenty of merchandise to fund charitable donations, and generally getting a kick out of performing.
So with a little help from her set-up crew (and overtime pay), she'd converted the warehouse where she was storing all the extra gear and other devices for her act into the perfect Halloween Party Pad. Called in a couple of favors to get Scare Tactics to play (she used to open for them, before her own act took off), gotten catering (including an Ace of Cakes made Halloween cake), and gone all out. Beer for those who wanted it, punch, everything.
And, of course, she'd invited all her friends, and encouraged them to bring and invite their friends. Which, given the number of people she knew, was quite the large group.
For her own part, Avia was dressed as, of all things "Sexy Escape Artist." The costume was clearly based on her own, albeit with a very short skirt, low cut top, and only a partial mask that allowed her hair to be free. She'd seen it and just had to buy it.
Of course, she'd then sent pictures to lawyers to get that ball rolling.