"All of these are not applicable to both events or people" is grammatically incorrect and it sounds clumsy.
A clearer, cleaner sentence would be:
None of these are applicable to either events or people.
"Some of these are only applicable to either events or people" would not be a valid version for two reasons: the words "all" and "Some" are not synonyms and because the original states that the subject matter are not applicable, where your version shows them to be applicable.
"All" is defined as: the whole of (used in referring to quantity, extent, or duration).
On the other hand, "some" is defined as: unspecified but considerable in number, amount, degree, etc.
However, while it would not be entirely true to the original sentence, you could use "some" in this context:
Some, if not all of these are inapplicable to events or people.