Check out the events calendar on Rankings HQ
If you are thnking of the Gosford Shield in particular, this will be running in March this year. This is mainly a result of a change in the organisers, but is also because DogCon in January is now both 40K and WFB.
The tournament calendar for Central Coast and northern Sydney for the next few months is:
Cryx Cup XI - Good Games Burwood - Mon Jan 3rd
DogCon - Castle Hill - Jan 22nd - 23rd
Tactical Smackdown - Good Games Gosford - Sun Feb 13th
Clash of the Titans - Cherrybrook (near Hornsby) - Feb 19th - 20th
Gosford Shield - Tuggerah - Mar 6th