The HSCC calendar is here
http://www.hscc.org.uk/Calendar.htm
No Monaco Historique next year, but Pau is 26/27 May
Goodwood Festival 22nd-24th June
Porto 13th-15th July
Goodwood Revival 31st August-2nd September
Of course, all it takes is one GP date to change, and the whole thing could be thrown into confusion......