Bring a t-shirt (or other adornable garment) and try your hand at the messy end of screen printing. It's as simple as mixing ink, putting it on the screen, squeeeegeeing it, then heating the result to fix. Repeat until garment is unique enough for you! There will be mess, and it's best you probably wear gloves. Light tone garments will be easier to get a good result.

EDIT: moved to sunday!