Queued all day in December '76 outside the Free Trade Hall, Manchester to get tickets for the W&W tour got to 20 feet from the door and told 'Sold Out''. Out of the country for Knebworth '78, saw them in Manchester 2 x Duke April 1980, Birmingham NEC Abacab Dec 1981, Milton Keynes Oct 1982, Roundhay Park '87, and Old Trafford '07.
Just an aside, this year (my 60th and events subject to this bug going around) is a hell of a Genesis music year - saw TMB Genesis Extravaganza II in Feb, got tickets for The Watch in April, Steve Hackett in November, Genesis in December and TMB - The Lamb next February!
Not sure people can remember how hard it used to be to get tickets for gigs - sitting on the phone continually dialling, no redial facility, no websites etc