Absolutely! There will be drinking so if that is something you'd prefer your kiddos not to see, please make other arrangements for them. Don't feel pressured to bring them either - this can totally be your excuse for an adults-only night!
If your invitation says "and guest", please do, otherwise we prefer it was just you!
Super casual - seriously, show up in jeans and a t-shirt. This is a total back yard BBQ style event so dress comfortably!