Regional Gift eggs event - kangaskhan

To my knowledge, it depends when the gift is accepted. So if you send me a gift on September 30, but I don't open it until October 1, I can't get a Regional from any egg that I may get from your gift.

Because the contents of the egg are determined when the gift is opened, the likely answer is no.

Same way as gifts received before the event could give a regional if opened after it began.

Nope, hatched a kanga from my friend who send a gift a block away from me (in the US)

If the egg will hatch a regional, is doesnt matter when you hatch it, thats how people hatched various hat pichu after their events end, the pokemon's rolled when you get the egg, not when it hatches, so it will still hatch into a regional after the event ends (assuming it was rolled to be a regional)

The egg itself needs to be in your 9/9 egg list before the event ends for there to be a regional chance.