1. Gut the insides out of a broken laptop.
2. Put a Wi-Fi Raspberry Pi, GPS, and a g-sensor in it, so you know if it gets moved, and how far.
3. Fill the rest of the empty space in the case with explosives.
4. Wait until you see that your laptop has been stolen and is still on the move.
5.

6. Profit?
Haha, now you can be sure there will be feds all over the conference.