It's my local track so I compiled this earlier on this year:
July
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Fri 08 tracktime promotions
Sat 09 tracktime promotions
Tue 12 100 pc bikes
Fri 22 hottrax
August
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Mon 08 tracktime promotions
Thu 18 100 pc bikes
Mon 22 hottrax
September
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Fri 02 tracktime promotions
Mon 05 100 pc bikes
Mon 19 tracktime promotions
Fri 30 hottrax
October
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Tue 04 100 pc bikes
Fri 14 tracktime promotions
More details from here:
http://www.croftcircuit.co.uk/
I'd book early (more than 4 weeks in advance) if you want to go in the novice group, they're pretty much all booked up for August right now. You can always turn up on spec for an afternoon session, people always crash so you take thier place for about £60.