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Jack, I never went to the Beer Engine but I vaguely remember a few gigs being on there. I watched Arthur Brown and Ed Tudor Pole at the Mill at the Pier quite a few years back (that's an interesting story for another time).
T Rex were on at the Ritz cinema in Wigan just after the transition from the former progressive/folk/underground Tyrannosaurus Rex to a more pop style - but to be fair they played a lot of old acoustic stuff.
Snafu were a good band; possibly best I saw at the Casino was Sassafras who were brilliant.
Hope the Who gig has favourable weather for you.
Getting back to the Ritz, I saw some good bands/artists there - King Crimson, Nick Picket, Curved Air, Keith Christmas, Garry Moore, etc...