For those playing this down... other than having to give the flags back (if that's the case), which makes us look cheap, I think it's a great idea.
Remember there have been thousands and thousands of little kids who have had to endure an absolute shit show for the last year. They just like to go to the game with their mum & dad, but it's been fucking dreadful. If they're school age, they'll be getting the piss ripped out of them every monday. No worthy heroes to worship, and the guy whose name is on the back of their shirt is often getting made to look shit.
This is the stuff the kids love. Dare I say it, they are likely to see a win at BDTBL, a great performance, and they get to wave the flag of their team around with pride. Can we let them at least have this