You can find also some recommendation which the expression was connected to rustic or inadequately educated individuals and not with advanced city folks. For example, from Francis Smith, La nostra tecnologia di intelligenza artificiale impara e migliora costantemente, assicurando traduzioni sempre aggiornate con gli ultimi modelli e tendenze lin

I might use 'on' mainly because a weekend is two times (or even more). 'At' is a lot more specific, for a smaller sized location or shorter time, whereas on/in are useful for more time durations or bigger spaces. "Let's take in at an Italian restaurant at 9pm" in opposition to "Let's take in in downtown on Friday". I believe free of demand(s) is