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This is how one might fix the following sentence.
"The festival was to be held today, however, it was canceled due to the rainy weather."
What is
"The festival was to be held today; however, it was canceled due to the rainy weather."
Or
"The festival was to be held today. However, it was canceled due to the rainy weather."
(comma preceding the conjunctive adverb – INCORRECT. Note: The comma following the conjunctive adverb is correct and should be left as is.)