Each year the local Power Squadron collects expired flares and has a flare demonstration that anyone can attend.
They get the local Police, Fire Dept. and USCG. They also call the area air ports and heliports and make announcements on Ch. 16.
Everyone gets to shoot their own flares or give them to others who have none and want to learn.
I don't keep my old ones. I shoot them off myself, just to see how they work.
Where I work at, we have over 100 that expire at the same time. First time we decided to shoot them ourselves. Called USCG, made
announcements and everyone had a chance to shoot them. Everyone shot 4 or 5 and went back to work. Since we are 100' above the
water, we would shoot them at the water and watch them skip across the surface. One guy sat and watched every single one of them
and ended up with burnt eyes, just like a welding burn. He woke up and couldn't open his eyes. Crusted over, burned like hell.