Is the first bolded sentence in response to the question grammatical?<br/><br/><i>What's the occasion?</i><br/><br/><b><i>a. The occasion is there is a late-night festival at the viaduct.</i></b><br/><br/>If this makes sense, then it must be reduced from b, right? Because what follows 'is' must be a dependent, noun clause...<br/><br/><b>b. The occasion is <u>that </u>there is a late-night festival at the viaduct.</b><br/><br/>Please ignore what I think would be the more standard way to say this:<br/><br/><b>c. The occasion is a late-night festival at the viaduct.</b><br/><br/>Thanks