I thought this event might be a fun way for Orihime to realize she's an Enlightened and unleash her newfound abilities. She'll probably start off just wielding a baseball bat and getting ready to fight along with the others. If someone gets hurt, boom, abilities manifest and she can heal, shield, and attack. So while she probably wouldn't be part of an official group (unless she happens to be hanging out with someone she already knows when the attack happens), I am all for her stumbling on someone else's group and tagging along because it's better than leaving her to fight on her own.