I usually do 5 BMW trackdays a year for the Club, and to be honest it's getting harder to fill them although (touch wood) we have yet to lose money on an event.
Silverstone GP circuit is our main event each year - out on the big circuit and using all the F1 paddock - I aim for 125 cars each paying £275 just to break even on the £30k circuit hire!
The more 'modest' circuits cost around £10k to hire in the summer months. So you need lots of commitment, or you risk getting your fingers badly burnt
In a full entry of every sort of BMW, I have never had more than a handful of Z4's
In all honesty, I would not bother doing your own - even a 'cheap' airfield day runs into £thousands - and forum people (god bless 'em) get exited very quickly but pay very slowly, if at all.
You are more than welcome to use one of my days if you wish and if you could get a reasonable sized group together I would extend our club discount to you all and you would get the best price.
The trouble is, like me they are all northern!
Here is the blurb I send to our members - remember the prices are for your group and our members only
Confirmed track dates for 2012
Feb 22nd - Oulton Park - £120 - full circuit
May 14th - Cadwell Park - £175 - full circuit
July 16th - Croft - £200 - (one of the very few noisy trackdays allowed here this year)
Sept 24th - Silverstone Arena GP - £275 - full Grand Prix circuit and paddock
Nov 7th - Oulton Park - £120 - full circuit
All our trackdays are exclusive hire (that's just us), are open pitlane and have generous sound limits, usually 105db.
Entry numbers are capped to a sensible amount of cars.
Free professional ARDS instruction at each trackday.
Friendly club atmosphere
Trophies and Prizes
All abilities catered for
Prices shown assume BMW Car Club membership
Non members welcome