Was searching for a film picker when I chance across this thread.
Had been through the same "embarrassment" last year, happily took my FE camera (with 1st roll of film) to take pictures during a friend's wedding. In fact I disrupted their lunch several times to get them pose for pictures. Done all that without realising that the film wasn't latched on properly, and the rewind knob did not turn when I advanced the film.
Sent the roll to develop after the wedding, and came back with no pictures.