Correct the errors in the sentence: Just to clarify: Is Friday tomorrow?

Corrected sentence:

"Just to clarify: is Friday tomorrow?"

Explanation:

• The word "случай" (case) was added for completeness of the phrase "на всякий случай" (just in case).
• A dash was used to separate the clarification "пятница — это завтра?" (is Friday tomorrow?).
• The question mark is retained, as it is a question.