Dave, I can't give you details on the Flint Michigan concert (yet), but I can give you some idea about Glen's concert appearances around 1967.
In 1967 Glen did a number of appearances as part of country music shows together with other country artists. In that year Glen had two hits 'Gentle on My Mind" (released June '67) and "By the Time I Get to Phoenix" (released October '67) and toured around a bit (next to his still busy studio work) as part of these shows. I think when he got the 4 Grammys in 1968 for those two hits, he gradually started to perform more solo concerts, a trend that accelerated of course after his tv appearances on the Smothers Brothers Comedy Hour and The Summer Brothers Smothers Show.
You can get a good impression of what a Glen Campbell set during 1967 sounded like here, from a September 1967 Hollywood Bowl concert in which Capitol Records presented its country artists.
http://crooksandliars.com/gordonskene/b ... ell-and-me" onclick="window.open(this.href);return false;
The 1967 performances by Glen I have been able to find were:
KRZY County Music Spectacular (Albuquerque, Feb 1967) - with George Jones, Melba Montgomery, James O'Gwynn, The Dave Kirby Trio
solo concert at The Hitching Post (Albuquerque, June 1967)
The Country Sound at Hollywood Bowl (Hollywood ,July 1967) - with Buck Owens, Merle Haggard & Bonnie Owens, Dick Curless, Ferlin Husky, Tex Ritter, Red Simpson, Geezinslaw Bros., Wynn Stewart
solo concert at Mr. Lucky's (Phoenix, July 1967)
solo concerts at Caravan East (Albuquerque, August 1967)
country show at Hollywood Bowl (Hollywood, September 1967) - with Merle Haggard, Tex Ritter, etc. (see audio clip above)
Dance Party at Hollywood Palladium (Hollywood, October 1967) - Glen as headliner and Jerry Inman, Mary Taylor, Sonny Curtis as special guests
Nashville Night - Country Music Spectacular at Arizona State Fair (Phoenix, November 1967) - with Ray Price, Hank Snow, Roy Clark, Wanda Jackson
country & western show (Salt Lake City, UT, December 1967) - with Red Folley, Lynn Anderson