Looks like Blackpool is having 8 nights of 10pm closures this year, spread through the season.
Fireworks haven't been confirmed for them all, but are likely to happen, at least for most.
The fireworks are not in the Towers league, but are pretty good and the park isn't rammed for them.
There is also lots of talk following a customer survey that the park might shift opening hours later... to lunch - mid evening from 2018.