I might use 'on' for the reason that a weekend is two days (or more). 'At' is a lot more specific, for any more compact area or shorter time, While on/in are utilized for more time durations or greater spaces. "Let's take in at an Italian restaurant at 9pm" towards "Let's take in in downtown on Friday". The noun sense of "ornamental festoon" is

@ShreevatsaR, @Kosmonaut: I are convinced Maybe the example I made use of was not the very best. I still feel that The 2 phenomena are associated, but probably only given that they both equally revolve all-around perceived ambiguities of plurality. ● البحث عن الفيديوهات التي شاهدتها أو أعجبتك أو حفظته