chodzi ci zapewno o pytanie:
https://www.etutor.pl/szukaj/?q=common+occurrence&mode=words_lists
w opisie hasła occurrence
https://www.etutor.pl/szukaj/?q=occurrence&mode=DICTIONARY&x=0&y=0
jest też definicja: występowanie zjawiska

polskie wyrażenie 'zjawisko' oznaczało coś nadprzyrodzonego i rzadkiego, tak więc użycie tego słowa oznacza zdziwienie, że tak jest, że coś takiego występuje
użycie tego słowa jest swego rodzaju idiomem, a tłumaczenie idiomów jest dość trudne

occurrence:

These mild fits are quite a common occurrence in babies.
a past occurrence of breast cancer
the low occurrence of heart disease in this particular group
words with a high frequency of occurrence in language
Increased life expectancy means that it is now a rare occurrence for children to be orphaned.
Landslips and earthquakes are not everyday occurrences in this country.
The document addresses the occurrence of arsenic in drinking water.
The program counts the number of occurrences of any word or group or words, within the text.
Vandalism has become a regular occurrence in recent times.

phenomenon:

His job is to investigate supernatural phenomena.
How does one explain this incredible phenomenon?
I observed a similar phenomenon in Bolivia.
She proved scientifically that such phenomena exist.
The movie has become a bona fide cult phenomenon.
The phenomenon occurs during early foetal development.
The phenomenon occurs in the early stages of pregnancy.
The unfolding energy crisis is very much a global phenomenon.
amazing natural phenomena the growing phenomenon of air rage
Harry Potter was the greatest book publishing phenomenon ever.
The Grand National, with bets worth more than £8m, is a racing phenomenon.
The research sets out to explain certain social phenomena in modern urban areas.
They claimed the depletion of the ozone layer was primarily a natural phenomenon.
This kind of crime is a phenomenon of the modern age.
This young pianist is a phenomenon.
natural/cultural/social phenomena

phenomenon ma dwa podstawowe znaczenia:
1. Something that happens or exists in society, science, or nature, especially something that is studied because it is difficult to understand.
(coś, co ma miejsce lub istnieje w społeczeństwie, nauce czy też naturze, zwłaszca coś, co jest badane ponieważ trudno to zrozumieć)

2. Something or someone that is very unusual because of a rare quality or ability that they have.
(coś niezwykłego ze względu na rzadką cechę albo posiadaną zdolność)

w odniesieniu do 1:
można użyć wyrazu "phenomenon" np. w takim kontekście:
Having a babysitter is not a new phenomenon (eg. in our society).

dlatego też osobiście sugeruję pozostawienie "occurence" (cos co jest "common" już nie jest "phenomenon", jak wynika z definicji słownikowej słowa).

pozdrawiam