Aside from a special exception for the wedding party, we'd like this to be an adults only affair. We adore your little ones, however, we would like our wedding night to be a night off for everyone in attendance. We hope this doesn't create a hassle for you as we just want to ensure everyone can fully unwind and revel in the celebration!
If your invitation specifies "and Guest," then absolutely! If it does not, we'd prefer if it was just you, in consideration of limited venue space.
Honestly, as long as you don't show up in gym shorts or pajamas, we are fine with whatever you'd like to wear! That being said, it is still a party, and it will be October in the mountains, so dress for cold weather!