Practice

This weekend I went through the entire Pixies set and indeed I'd forgotten how half or more of them went. On Saturday I played the entire set and I struggled...on Sunday I had remembered nearly everything again just from Saturday's refresher. All was well.

This supports my theories that
#1 About 30 songs is where my brain starts to forget stuff
#2 If you play a song every day you remember it, less than that it gets fuzzy the less you play it.

Neither of these is revolutionary ideas.

In summary...if I get lazy I'm going to have more freakout moments on stage. You gotta put the work in to get the results, even after you think you've learned a song. Even if practice is boring, it has value.