Yup, classic fail for a wedding / function is to let someone who's a massive fan of a particular band / style of music book
the entertainment. Been to many such events that have been a sorry (and often expensive mistake. ) You really have to go
for what will appeal to most of the audience for most of the event - bearing in mind you will never ever please everyone.
When I was in a function band playing at a wedding with usually a wide spread of ages/tastes in the audience, we'd usually
start with some quiet-ish old stuff (Sinatra etc) for the more elderly folks to enjoy and dance to. The younger people would
be at the bar or occasionally join in with the dancing, but generally be far more open minded about this than the old folk were
about modern material. By the time we'd got round to the loud more current stuff the oldies would have left anyway, so
everyone happy. Not exactly rocket science, but seen many pub rock bands struggle to keep any sort of audience in these
circumstances.