Would obviously take wine/beer to a normal house party but this is a formal invite to a 40th birthday party at home. There is to be entertainment.
Most 30th/40th/50th parties have been held in venues so the need to take alcohol hasn't arisen. I did go to a 30th (had a marquee in garden) many years ago and rocked up with booze only to find nobody else seemed to have taken any.
AIBU to take no booze? Will take a nice present for the party boy though. Have't seen him for a few years, so not close enough to ask.