Oh, that letter was left in front of the bar.

It only had your show's name written on it. A regular happened to pick it up and bring it in.

I figured it was just someone who'd heard the rumors but couldn't enter the bar, so they delivered it straight to you.

...By the way, is there anyone like that here today?

No, we've only had regulars coming in tonight.

...What, was there something suspicious?

Someone who heard about this show from a participant... and who's a huge Swallowstone fan at that.

That still leaves a lot of open questions...