What does the Gregorian calendar mean that everything should be feasible on auspicious days?

Everything is feasible, which means that everything is suitable and there are no taboos.

Nothing should mean that nothing is particularly suitable for this day. The so-called "everything is not suitable" means that it is not suitable for major events such as getting married, opening a business, going out of town, starting a business, and entering a household. Doesn't mean you can't do anything in your daily life.