How do you handle disappointment?

How many times have you prepared yourself for something really major maybe, it’s your first time addressing a conference or an exhibition. You have practiced your presentation, your slide show is the dogs doo dahs, you have selected your outfit for the day so you look a million dollars and when your moment comes you will shine and your presentation will be really well received and you will lap up the adulation. Then a week before the event you find that you can’t go ahead because you’ve caught Covid or some other similar virus, I’m certain you would feel gutted