There are only two that I know of that are regular, there are more but I have never been on them, you can get the info about them here.
http://www.hunterdistrict.com/bunch_rides.htmHere are the two that I know are still going
Wednesday - Mornings
There is a bunch which leaves the racecourse at 7am. Raymond Terrace return, rolling turns prcticing paceline dicipline. Focus on smooth turns and transitions at speed.
Grade MEDIUM-HARD approx 70-80 kms by the time we get home. In town about 9.00am.
Saturdays – All year round
Meet 7am car park adjacent to Hadley Cycles Lambton.
Grading EASY Distance 38k
Returning around 8.30am
Many people join along the way and some depart early, so you don’t have to go the whole distance. Bring your own pump and spare because we don’t stop for punctures and there are plenty of short cuts for riders who puncture.
I am sure some others can add and confirm the other rides.