To throw a suggestion for where and when?
As has been said Turbosport meet at the Halfway House on a Sunday good access from London area and beyond and with it being on a weekend a day out.
The S.E.O.C. essex meet is at the Duke of Wellington in Hatfield Peveral on a Monday night. This pub is just of the A12 again good access Chelmsford/Colchester area's and beyond, being an evening meet may limit people driving to far to make a return journey.
Not sayng to highjack these meets but I know both of these pubs have large carparks.
I know from experience it can be hard to get a new meet off the ground, especially during the darker nights, but I believe it can be quality not quantity that make a good night
Any suggestions?