Not sure as it’s so long ago,
But first I still remember was Nils Lofgren at Leeds University
Support act was way way better to the extent that when Lofgren had finished, folks were chanting the supports acts name ….
Still haven’t seen them headline although I did catch them supporting at Knebworth.
I really wish Tom Petty would tour the UK more, can’t make the only date this year
….
And through the power of google I can now say it was 21 May 1977 …..