I was the beneficiary of having a friend whose cousin was a ticket taker at the Garden. We would get two tickets and would walk a friend to the ticket taker. Would say, “Cousin sent me” hand the guy 5 bucks and go all the way to the blue seats so no one would check our tickets.
Then the person would take back the two tickets and walk someone else in. We did this for pretty much the years of 73 through 78. I saw Zeppelin, The Stones, The Who, Fleetwood Mac, Tull, Pink Floyd, Rod Steward, Bad Company, Deep Purple, Black Sabbath, Kiss, Aerosmith, Boston and many others this way.
The highlight of my concert attending career had to be Zeppelin doing their Physical Graffiti tour. I also saw the Presence tour and saw Zep a total of six times. The Animals tour from Pink Floyd was nothing short of spectacular. I liked it better than The Wall.
Connections like that sure are rare! The only one on your list I saw was KISS, with my parents. Styx was their opening act (1977). Never saw Zeppelin but I had their PHYSICAL GRAFFITI album, the original die-cut one where the bldg. windows interacted with the inside liner note images. Cool.