I think with induction you only ever hear the horror stories, or the really positive experiences and the average, normal induction experience is a bit of a mystery. My sil has been induced twice, once via pessary and once with the drip. She said the pessary one, whilst it took a couple days, started like spontaneous labour as her waters broke and started contracting. Labour was only a few hours and was fine. The drip was a little intense, but she reacted quickly and only laboured an hour. Only gas and air for each and both very manageable. If you've laboured before inductions meant to be much better I've heard too. You'll be brilliant, being able to work around a date is really good too, but must be a bit surreal if you haven't been induced before.
I'm sure your DS will understand, but I can see why you'd feel guilty, even though there's no helping it. Is it a big class party or a smaller treat with friends? I hope its not too difficult to move the date.
Don't rush it with getting things sorted, you need to take it easy and give yourself time to process, it's a lot to get your head around in a short space of time. Everything will get done in time, these things always work out and its never as much to sort as it seems.