I was banned from doing ours after the Greece 2004 debacle.
We didn’t have enough entrants to cover all teams and rather than allow second entries, i decided that we’d exclude a couple of no-hopers from the draw, and if the impossible happened and they went on to win we’d donate the money to a local charity instead.
The Children’s Trust ended up with an unexpected donation, we got in the local paper, and i was henceforth banned from running it again.
I still do the Grand National one, and to appease the no-hopers we have prizes for 1st, 2nd and also for the last horse to complete the course with jockey still on board, that way even the shite horses can still win you something.