@Gayle51 Most probably you will be penalised and arguably rightly so. Hosts were given the ability to cancel penalty free in before end May (if I remember rightly) and that would have been to time to do it.
You could ask the guests if they still wish to come. Some may well be waiting for Airbnb to extend their ability to cancel although this is by no means certain to happen.
Alternatively you could suggest a mutual no fault cancellation to the guests but they may well be most unhappy to be let down this close to their holidays.
At the end of the day you can just cancel and take the fines and loss of superhost status.