To be fair, The Pacemakers will probably just do 3 or 4 songs and then concentrate on backing some of the other acts like Dave Berry and Steve Ellis. Vanity Fare have done the same on previous tours.
The Merseybeats, Marmalade and Steve Ellis are all well worth seeing, as are I suspect the current incarnation of The Tremeloes.
Out of the whole show, Dave Berry is the one I'd like to see! Love most of his classic Decca works. It was you who posted that video of him on French TV doing "Walk Walk Talk Talk" and whilst not exactly a gem, I much prefer it to the dreary A side!
I must admit, I've never been much of a fan of Dave Berry, finding his voice a bit flat and tuneless. I still look forward to (hopefully) checking him out live though, as he has a reputation of being a good performer.