Bring a Christmas ornament you'd like to modernize - we have soldering irons, LED's electroluminscent wire and microcontrollers, and we'll show you how to use them! Make a blinky wreath! A glowing ornament! How about a snowflake that changes colours! Even if you don't bring your own, we have some there you can hack.
The workshop is free and goes from 11am until 5pm - electronics are provided at cost (they range anywhere from $10 to $30 or so, depending on how complex you'd like to get).