Calling all Deadheads on Tildes!

I've listened to the Grateful Dead sporadically throughout the years but never really took a deep dive. The incredible goldmine that is https://archive.org/details/GratefulDead is just waiting, mysterious and silently beckoning... but I have no map of the landscape so the question is, where to begin?

What are your favorite recordings?

Edit: Thank you all for your suggestions. I'm so eager to listen them all through!