If It's Tuesday, This Must Be Belgium
From The Art and Popular Culture Encyclopedia
If It's Tuesday, This Must Be Belgium is a 1969 romantic comedy film made by Wolper Pictures and released by United Artists. It was directed by Mel Stuart, filmed on location throughout Europe, and features many cameo appearances from various stars.
The title, also used by a 1965 documentary on CBS television that filmed one such tour, was taken from a magazine cartoon caption, humorously depicting the whirlwind nature of European tour schedules, which formed the premise of the film's plot.
The film was remade in 1987 as a made-for-TV movie titled If It's Tuesday, It Still Must Be Belgium.