The Wikipedia page on “auf” states that you would use it in one context instead of the traditional “bei” or “in,” and separately, “in” and “zu.” Under what conditions would you make the substitution, and why? If you can’t point to any reason in particular, what are some other nouns with which you would use “auf” to mean other prepositions listed above?
Wikipedia page: https://en.m.wiktionary.org/wiki/auf