You are more than welcome to bring your children. However, there will not be childcare provided.
If your invitation indicated that you could bring a guest, then yes, you may bring a date.
We will be dressed formally, so we'd love this to be an excuse for you to get dressed up too. However, you can feel free to wear whatever you'll be comfortable in.
Certainly! In fact, if you're not dancing, we may pull you out onto the dance floor ourselves!