Final answer:
The sentence is correctly punctuated with necessary commas to clarify the meaning.
Step-by-step explanation:
The sentence, 'During the track meet, I wore a fake mustache, which shocked Eijiro Kirishima,' is correctly punctuated. The comma after 'meet' indicates a pause in the sentence, and the comma after 'mustache' sets off the phrase 'which shocked Eijiro Kirishima.' Both of these commas are necessary to clarify the meaning of the sentence.
Learn more about Punctuation in English sentences