They only charge on the 4th of July, so it's just a one day thing. xD They only do it because of the large number of people that attend the event, haha. Every other day of the year, it's free parking. Some of the parking lots near the park itself charge for parking as well due to their proximity to the park itself, but yeah.
Oh, wow. My mom & I saw some fireworks the other day when we went to Wawa. Fireworks are illegal here unless you've got permission to shoot them off, so the ones we saw were illegal, but they were nice. xD Except they were a little late, haha.