Matt - I reckon that Friday night would be ok, quite good in terms of a 'social' night to race.
Reckon you should attract the same crowd as the other races round there e.g. the Hillock, Cobra Classic and maybe even the Wyre Forest races, and the Worcs MT Series. There should be plenty of takers.
Good luck ... I'd be there!!
Just a thought though - not too early, because of the motorway traffic. I've really struggled to get to events such as DK10K on time - a running start, straight through from the car park! :-)