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Let your guests burn off all that sugar with a match or two of backyard Quidditch.
Speaking of potions, invite your guests to watch as you brew a color-changing potion for them to drink.
Potion bottles also make for great party decorations.
Add a bit of decor by having letters "fly" out of the fire place.
Give each of your guests their very own wand.
One more cupcake idea — use sugar cones to look like wizard hats.
Serve up some "Mandrake cupcakes."
Have your guests enter your home the same way they'd enter Platform 9 3/4.