www.amoc.org
Their events preview isn't up and running yet, but here is a list of their race meetings this year.
June 3/4 Donington
June 24 Silverstone
July 8/9 Brands Hatch
August 6 Snetterton
September 16 Oulton Park
October 1 Donington
Keep an eye on their site, and hopefully they'll post which of these will see the Group C cars.
Saw them last year at the summer Donington fixture.
Group C... Kraner curves... mmmmmmmmmmh