[talkSAFT]

".......Only 7,285 turned up for the midweek draw with Liverpool, but today, Chapman's Gunners attracted three times that amount with 22,115 in the ground. Was it because of the returning hero or was it just because it was on a Saturday afternoon rather that a Wednesday afternoon? I don't know, still waiting for somebody to explain the strange variations in crowd numbers. Of course, that attendance would treble again for the FA Cup quarter final match in 1932."

The 1st Floodlit matches were not until the early 50s. So workers/schoolkids weren't able to attend midweek games, generally.