correct the text by inserting one comma.\nunless the caterer is late this banquet should go off without a…

Brief Explanations:

In English grammar, when using "unless" to introduce a conditional clause, a comma is often used to separate the main clause and the "unless" - clause for better clarity. Here, the main clause is "this banquet should go off without a hitch" and the "unless" - clause is "the caterer is late".

Answer:

Unless the caterer is late, this banquet should go off without a hitch.