Depending on where you are, you can file a police report and see whether Apple and carriers might block access to 3G and iTunes by using the IMEI and serial numbers.
You also can file a claim with your homeowner's or renter's insurance, if you have them. And you can check whether your credit card company covers such losses if you bought it with a credit card.
Even with iTunes and 3G blocked, a thief could use workarounds to use an iPad, and the thief might just sell it (or might've already sold it to an unsuspecting person).
If you social network, you might also post about the theft on your Facebook page, in case someone saw something at your party.