There are many Kipper books, mostly pretty good, and I think this is one of the best. Kipper paints party invites for each of his friends telling them to come at noon tomorrow, and then he leaves it until the following morning to deliver them. And at midday nobody comes, of course, so he eats the cake all himself and has a good long sleep, until noon the following day when his visitors arrive, a day late. Amusingly, Kipper then re-reads the invite and thinks his birthday is yet another tomorrow, but fortunately his friend Tiger can clear up the confusion and they can get on with the celebrations.
I bought this Kipper because we'd read it at a friend's house and I thought it helped explain the relative nature of the yesterday/today/tomorrow concepts which my daughter was beginning to grasp at nearly three. Now at four and a half she completely understands the mix up but my two year old son can't quite follow it. So this particular Kipper is probably better for a three or four year old though the younger child would still enjoy it, and although they wouldn't fully understand it yet they'd grasp the idea with a little rereading.
Finally, as with all Mick Inkpen's books, the illustrations are beautifully done, with clean lines and gently appealing.