Good idea Paul 
Chinese lanterns are dangerous, dangerous to other people. Lasers are dangerous to us while at an LEM and we accept that but we just cannot fly potential fire bombs all over my village and put others lives in danger. It's quite simple really. At one LEM when they where being let off, I was driving a quarter of a mile down the road from the hall and witnessed on of these lanterns landing on a barn roof, sliding down the roof and luckily going out. That was enough for me to ban them from our LEM's! That barn roof could have been a huge straw stack etc
As for Mill's - I have said before - if you want to bring one I have NO problem with that just as long as EVERY bit of evidence of it being at the hall is removed before we leave on the Sunday evening by the persons using it.
Fireworks, Again, they are dangerous to others not at the LEM and thus are banned. Especially when Chop has ow't to do with them! Plank!
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Continuously in Awe! of (H)Al, the Photonlexicon Font of Complete Knowledge - The (H)Al'PL Database of complete puss that no one needs to know or ever trusts as he ain't really got a Scooby doo about now't!