Hi there
I live on the Central Coast as well - Berkeley Vale. I've been going down to Erskine Park every Saturday for the past 4-5 weeks. It's great - well worth the drive. It's is on most Saturdays from 9am to 3pm with an hour's break for lunch from around 12pm. It's also on most Sundays though I'm not sure of the times - possibly the same. Every month or sometimes more often they run a trial so it's not on that weekend. There is a trial today and the next trial is on the 26th September. I'm not sure what happens after the next trial. I think they take a break over Christmas but I'm not sure for how long or when it starts. I'll be asking next Saturday.
Anyway, give it a go - it's really fun. My German Shepherd, Mysty, enjoys it so much I have trouble getting her in the car to go home at the end of each training day - this is the same dog who readily jumps into the car without an invitation usually!
So, maybe see you there sometime