Let's see... what other Clan Holidays could we MacMillan's come up with?
Invention of the Bicycle Day,
Encyclopedia Britannica Day,
SuperMac Day (the Prime Minister, not the hamberger),
Don't Slurp Your Soup Day (where everyone eats Baxter's Royal Game soup),
and The MacMillan Nurses Day to remind us all of the tireless good works these ladies perform everyday.

I think I'll send them a cheque. Today.