i believe its on the 17th of september on the promanade it was 3quid last year so it will probably be the same, i think the gats open around 9:00am and its usually on till about 5pm, i dont think any club is the actual organiser.
found some info:
The show is basically a park on the promenade affair facing the sea.
There are lots of clubs that attend this show
You can park there all day & into the evening.
There are marshalls around for security until approx 5pm.
You can wander off around Blackpool and do what you want all day.
Its a great day out for all the family.
Warning- There is a no drinking on the streets rule in Blackpool.
hope all this helps you.