Pumpkins do end up all over the place after Halloween, as you say most are carved for lanterns and then Disposed of although no always in a responsible way.
A bigger issue fireworks, which have been active a good week now but Friday and Last Night it was constant explosions from 5pm onwards - given Friday we had strong winds it is down right dangerous. They keep saying that sales will be restricted to organised displays but it never happens.
Safe travels to SteemFest - maybe you will find a whole running crew to join in.
I didn't see any spent fireworks. There was a big display up the road last night and another nearby tonight. Our cat didn't like it at all and it's not great for those with horses. I don't see much point in doing it at home as the big displays are much better.