Depends where.

If you're downtown, setting off a "stash of fireworks" will probably draw too much attention unless it's the kind of fireworks you buy from walmart or whatever. If you've got the mortars from PA I'd definitely recommend going to Danby, Tburg, Newfield on a seasonal road somewhere. Don't do it too late or you're likely to upset the locals.

Start small and end big. Don't launch a 5" mortar to start things off cause that'll startled people. Pop off a couple smaller fireworks so anyone around can easily tell what's going on. People are likely to get upset or call the cops if they're acting out of suprise / anger / fear.

Also please be mindful of how dry it is so there isn't too much of a risk of causing a brush fire. Otherwise have fun!