The folk customs of the Spring Festival in the north, in English, can be expressed as "folk activities of the Spring Festival in the north" or "folk customs of the Spring Festival in northern regions." If you specifically want to refer to the customs related to the Chinese New Year's Day (which is also known as the Spring Festival), you can say:
"Folk customs of the Chinese New Year in the north" or
"Folk activities during the Chinese New Year in northern China"
If you are referring to the specific day of the Chinese New Year, which is the day of the Chinese New Year itself and not just the entire festival period, you can say:
"Folk customs on the first day of the Chinese New Year in the north" or
"Folk activities on the first day of the Chinese New Year in northern China"
And for the term "立春" (the beginning of spring), which is the first solar term of the lunar year, you can say:
"Folk customs of the Beginning of Spring in the north" or
"Folk activities on the day of the Beginning of Spring in northern China"
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