I was at a picnic with a bunch of my friends and the park that we were at had a big sign that read: "No firework allow in the park, violators will be fine minimum $200" plus "no alcohol allow"...
It was all fine and dandy until after 8PM... a bunch of knee-grown, crackers and tacos teen, young adult started streaming into the park and lighting fireworks - in the parking lot, in the park ground, etc etc. I'm pretty sure they brought alcohol with them too... We left that place fast... didn't want any of those fireworks to go off and into our vehicles nor children get harassed by these people. The park was right beside a busy highway - no cops at all.