@jeremycherfas I've just been googling the hell out of this, because it does bother me that there's nothing else, seemingly, that seemed right to me. "Folks" is the sort of thing your manager writes to your team when they're talking down to you. Y'all is never going to cut it in New Zealand, sorry. But "Hey everyone," sounds quite nice, inoffensive, is inclusive and carries no cultural bias/weight/power imbalance. I reckon "everyone" suits me :)