My bad, I should have read the FAQ more and posted this in the forum to begin with, but I assumed it would have simply updated the Festival Date Range. Added a concert for Eleanor Friedberger on the 29th January, this was played for the Sydney Festival 2012.
The Sydney Festival 2012 date range on the site was originally 7th Jan to 28th Jan, when in fact the festival ran between 7th Jan to 29th Jan, My addition has caused a duplicate Sydney Festival 2012 to exist.
Once again, sorry for the hassle and hope this can be fixed up easily!