Hi Cindy. Which theme settings are you running? We uncovered a bug the other day that keeps the comments box from appearing at all in the Default Page Template. We’re working to get that fixed for a patch release very shortly. Apologies for the inconvenience in the interim.
Cindy: the comments would have to be both enabled under Settings –> The Events Calendar, and then turned on within the individual event posting on the backend. If you turned on comments after publishing an event, for example, you’d likely need to go back into that event and manually re-turn on the comments there.