We've launched our marketing calendar for 2021, which provides a template and a full list of holidays (including Drive-In Movie Day, who knew? I've never been!).
I hope this is helpful! Also, I'm curious. For Retail, which holidays do you usually focus your efforts around? Black Friday and the end-of-year holidays are obviously major periods, but given retail is such a broad category of businesses, are there other holidays that work better?