Great, thank you! I’ll just add what on my mind – there is number of holidays dependend on the Easter date (like shrove tuesday, fat thursday, Corpus Christi etc. etc.; so easter_date() +/- number of days), and on particular weekday in a particular month, like thanksgiving (forth thursday of november), cybermonday (monday after blackfriday), mother’s/father’s day in some countries etc. I guess they are easy to define/set with a little bit of code and a simple form.