Welcome to our friendly Airstream community. You will find much info shared here amongst fellow owners, especially if you browse the Motorhome area. Also the sister site AirstreamPhotos.com has some great stuff to view.
We are scattered across the US and beyond, so I personally don't know of any rallies out your way, other than the nationwide Rapid City S.D. one, and our Western Florida motorhomers rally which is too far for you to attend. There will probably be posts from those closer to you.
Meanwhile thanks for jumping onboard.