The sentence that should have commas removed from its restrictive phrase is:
My friend, who likes to wear bowties, is going with us to the dance.
In this case, "who likes to wear bowties" provides additional information about "my friend" but is not essential to the main clause's meaning. However, if you want to retain the restrictive sense, you should change it to "My friend who likes to wear bowties is going with us to the dance," which emphasizes that you are referring specifically to the friend who likes bowties.
So, the correct change would be to remove the commas to clarify the restrictive nature of the phrase.