We love your kids but we want our wedding to be your night off.
If the invitation says "and Guest", then yes.
There will be lots available to park near the venue along with someone directing where to park. Carpooling or Uber/Lyft is strongly recommended.
Cocktail to Semi Formal, but we also want you comfortable. The weather will be cooler as we'll be in the mountains so don't forget a jacket and comfortable shoes to dance the night away.