For family- yes, because they're family. For friends- we want our wedding to be your night off!
Sorry, no. But if you live in residence inn you can just walk over. It's THAT CLOSE.
If your invitation says “and Guest,” then yes, if not, we would prefer if it was just you.
Semi-formal would be nice. But please keep in mind, the ceremony is in September at a garden. Please check the weather we don't want you to overheat. Don't worry, if it rains, ceremony will be indoors.