The four capitalization errors in the sentence are:
A capitalization error is one in which a word is wrongly capitalized.
Nearly all proper nouns begin with a capital letter. There are some exceptions to this rule, and in marketing, some proper nouns may occasionally be used on purpose with lowercase letters.
Oneworld Alliance, eBay, and the iPhone are among examples. Proper nouns typically begin with a capital letter, though.
Other rules of capitalization are as follows:
Hence the corrected sentence is:
Semana Santa, an important religious festival in Catholicism, is celebrated throughout South America with processions through the streets.
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