The most diverted flights in one day was on 8/1/87
And what a shift that was
As CJ mentioned, close on 72 divs, squeezed together in the NW corner, down the taxi-way centre line, they were everywhere.
I remember that day well as I worked about 18hrs. The last movement I was involved in was a Dan Air 1-11 ferry to LGW but it was out of trim so the options were (a) crew jump back in the taxi and head off to a hotel or back to LGW or (b) find more ballast. All usable ballast had been used on other aircraft so I put my thinking cap on and headed off into the night to a building site I knew was not too secure
and returned with several breeze blocks
Job done....