So far, looks like April 21st is busiest day of the season for events...
Jim Clark Memorial, Hockenheim. (FJ & F2, 2 day)
Imola Motor Legend Festival. (Masters, 2 day)
Croix-en-Ternois. (500s, 2 day)
VSCC Silverstone. (2 day)
HSCC Snetterton.
CTCRC Croft.