North London skins came down for the Specials/Madness/Selecter gig at the Top Rank late '79 with some trouble I recall. Specials back a year later.
But you're correct in that the level of violence at gigs got progressively worse into the 80s.
I missed it all, thank goodness. Despite going to dozens of gigs then.
My wife’s uncle for decades worked at The Suite. He’s a mental list of the gigs where there was sustained trouble and how they ‘dealt with it’.