We now how have an official Premiership Final Series page located under the Premiership tab then click Premiership Final Series or click this link and it will direct you on to the page.
http://www.aucklandleague.co.nz/premiership/premiership-final-series/
This page will show you the dates, times and venues of the Semi Finals, Preliminary Rounds and   Grand Finals of both Premiers and Premier 1st grades.