I, if I can remember, usually try for something more gender-neutral like "hey everyone!" or "hey y'all!". A lot of the time I accidentally say "you guys", but I try and be more conscientious about it if I know that there's a trans woman included because I don't wanna come off wrong or be triggering... I can't ever bring myself to say "ladies" because it sounds really skeevy to me, and I don't wanna be one of those guys, haha.