From the wrong club website:
The action kicks off on Thursday June 5 at the Select Security Stadium where the Sky Sports cameras will be on hand to capture a repeat of the 1937 Challenge Cup final, Widnes Vikings v Keighley Cougars (8.00pm).
It is, too; somehow I’d completely missed that it’s a repeat of Keighley’s only Wembley appearance. Unfortunately, I can’t go. But I think that’s a pretty decent draw; obviously it would be better to pick on someone our own size like Leigh, but failing that Widnes is worth a try.