I would agree with Jennifer about the use of "on the weekend" in US English. It is helpful to know what is most common in England ("at the weekend"). Thank you. I was trying to think of anytime I might use "in", and came up with these: "We have extra time in the next weekend, because we have to turn the clock back 1 hour". another one: "There are 48 hours including sleeping time in ( "on" would also work here) the weekend and that is not enough time for me to do all the things I would like to do".
It stems from Old Norse 'helgr' which was related to 'heilagr', meaning 'holy'. The Norwegian word for 'holy' is 'hellig'.
The word for 'a saint' is 'en helgen' (yes, the indefinite form looks like the definite form of 'en helg'). While similar, it stems from Old German, but it also means 'holy'.
Surely nobody can disagree that the weekend is a blessing :)