My preference is to shift the regatta one week to the right. The regatta used to be a two day event (Sat and Sun only) and was still very successful. I'll still take the time off and go sailing on Friday anyway. You could even keep Friday optional and see how it works out. I think the A cat guys would appreciate it and it will be nice to have the extra space to work with. Don't most people bug out on Sunday anyway?
"Do or do not. There is no try." - Yoda "Excuses are the tools of the weak and incompetent" - Two sista's I overheard in the hall "You don't have to be a brain surgeon to be a complete idiot, but it helps"