What gadget should I pack to play with at #WHY2025 ?

a) a drawing tablet I got gifted almost a decade ago and didn't use since then.
b) A usb-dect dongle from SIEMENS for which I don't know if it even works or what it was supposed to do originally.
c) a mini computer which I haven't even tried to power on since I built it from very cheap used parts...
d) A mini-NES console (without the required analog to digital converter...)
e) ???