You never know who might show up at the wall!

It was the day before Thanksgiving and the weather was clear.  I was just hanging around when who should appear? 
This rowdy bunch named after a snake,
Of this I wasn't sure what to make!
After a few moments of shooting the breeze,
An exceptional group of Explorers it was easy to see.
Thank you for stopping you made my day,
please stop again when you're out this way!