By the 1968 Season, Sinjin Terrell had enlarged the variety of artist who performed in concert. Interspersed with the concerts, only five Musicals, a Burlesque show, and a Circus were presented. It appears only one of those Musicals was produced by Mr. Terrell ("Plain and Fancy"), the other four were package tours ("Hello Dolly," Finian's Rainbow," "Pajama Game," and "The Merry Widow." (These details have not been confirmed though.)
The Fifth Dimension

Kenneth Host sent in this memory of Marilyn McCoo and the Fifth Dimension.
Read About The Fifth Dimension
Gladys Knight and the Pips

Wes Montgomery

Wes Montgomery was scheduled to perform, but his death on June 15, 1968 at age 45, forced the cancellation. It appears as per some printed schedules that there was no replacement for the Wes Montgomery engagement.
Read About Wes Montgomery
The Four Seasons - Featuring the Sound of Frankie Valli

Gary Puckett and the Union Gap

The Paul Butterfield Blues Band

Blues Band
The Rock 'n' Roll World Championship (Battle of the Bands)

1966 Second Place Winners