I do what Angel Winks just said. There's a couple different ways to do it, depending on how you want to plant it... if it has clues or not.

You can either make it a traveling event box and call it a "hidden in plain sight" or "table top box", and just add a new event each time you move it. For these, you wouldn't have clues. Just leave it in the gathering room either out in the open or 'hidden in plain sight'.

Or, you can make it a temporary traditional box with Word of Mouth clues. For this, you can change the physical location of the box each time so it will show up in searches for that area. Then in the clues, just type available at whatever event and list the clues or state WOM clues available then. After the event, change status to unavailable.

OMG! You guys are CRAZY! Once I start listing boxes tomorrow and your printer bursts into flames - you'll stop printing :)

There over 200 just the night of the event - you'll get PLENTY of ink :)