Well, this birthday party occurs when she's still in school, that way I can think of something.

It's Hermione Granger's fourteenth birthday!

It will be held in Hogsmeade, just outside the Shrieking Shack (the birthday party planners thought that she would find the location nicely appropriate, after the events of last year), and these are the guests:
Harry Potter (party coordinator)
Ron Weasley (assistant party coordinator)
Fred and George Weasley (entertainment)
Neville Longbottom (decorations)
Parvati Patil (fixing the decorations Neville messes up)
Lavender Brown (music)
Seamus Finnegan (assistant with music)
Luna Lovegood (party "soothsayer")
Padma Patil (for emotional support to her sister, after dealing with Neville)
Colin and Dennis Creevey (so they don't whine about not being invited)
Moaning Myrtle (the same)
Dobby (food)
This is a
SURPRISE birthday, so keep your mouths shut about it around Hermione or prepare to be jinxed! We are not kidding! And we've learned a lot, so don't think we won't use them!
At the party, Hermione will be blindfolded and brought to in front of the Shrieking Shack, where everyone will shout SURPRISE! Then the birthday cake will be brought out. Dobby made it himself...with only a little help from the house elves. That's why it's in the shape of a giant sock, with red and purple stripes. He assures us, the coordinators, that the cake will taste good, anyway. The house elves have also prepared some other food that Dobby will bring with him (even cookies that say "SPEW" on them!).
Neville, with the assistance of the Patil twins, will decorate the area with plants that he has borrowed from Professor Sprout, as well as crepe paper and other decorations picked up from Hogsmeade. Lavender has every Weird Sister song ever made, so she will be in charge of playing them during the party, and Seamus will assist her. Luna will set up off to one corner, where she will...well, say weird things mainly. She says that Professor Trelawney has been teaching her little Divination tricks, so we'll see how that plays out.

Fred and George have been working on several mysterious things and while we're not sure quite what they are, we're guessing they will be amusing.
As for the presents...this is what everyone said they are getting Hermione:
Harry~A new copy of
Hogwarts, a History and a catnip mouse for Crookshanks
Ron~A bottle of Sleakeazy's Hair Straightening Potion
Luna~A year's subscription to
The Quibbler and assorted books on Nargles, Crook-Horned Snorkacks, etc.
Fred & George~A box of *something classified* (We hope it's something good)
Mrs. Weasley~She couldn't come to the party, but she sent along a blue sweater for Hermione.

Seamus, Neville, Colin & Dennis~ Assorted candies, including Chocolate Frogs, Sugar Quills, and Bertie Bott's Every Flavor Beans
Parvati & Padma~The autobiography of the Weird Sisters (to "loosen Hermione up more")
Lavender~A new potions ingredients kit
Let the party begin!

And happy belated birthday, Duckie!

I hope your birthday was better than you were expecting.