Cool. I'm guessing that opening week was probably booked solid with private parties and business partnership events, but I'll happily stand corrected. In any event, ZZ Top kicked it off for the rock shows members of the public could attend, with The Who playing the next night in November, 1975. I actually found a torrent for that Who show; google Who Summit and it comes right up.
I'm feeling some Summit nostalgia, clicking around for info in this thread. How amazing for Houston to have that legendary venue in its history, and that there were so many fans who were at both of those shows, who were still around 30 years later to share their memories when John Entwhistle passed on. How awesome that they were willing to call in on that day with real, solid memories of the person who stood outside and smiled for their photos with them and their aunt Tillies. How crazy to be standing at the last ZZ Top show beside people who were at that very first show, feeling a part of their lives leave them with the sale and ending of the venue. So much history. So sold.
A lot of people feel personally impacted when celebrities die, but have had absolutely no connection to those celebs in real life---outside of the pact of entertainer + long-distance consumer. "Listening to his music inspired me and changed my life! He was an icon for our times!" is something people say when they can't explain their feelings of loss and connection to a dead celeb. Entwhistle's fans said, "He asked how to spell my daughter's name and told me it was really pretty." "He talked to us like we were the only people there." "He had me laughing so hard my face hurt."
Somehow, I find that connection with the fans to be a little bit more real than mere celebrity worship. It tops in sincerity anything I've seen from those mourning Michael Jackson. I was glad to open up the phones and give those true-blue Who fans a chance to grieve. Unfortunately, in more recent years, it seems to me that celebrity deaths, in general, have been treated with the couth and tenor of yet another marketing blitz. Yay, Michael died, call the syndicator and see who's got the official Special so I can plug in my avails, and hey, let's do a weekend, we'll have a moonwalk contest and hand out prizes. You know, 'cause we're just so sad.